TOSHIBA STORAGE DEVICE CORPORATION Patent applications |
Patent application number | Title | Published |
20110090583 | MAGNETIC RECORDING APPARATUS AND MAGNETIC RECORDING MEDIUM - According to one embodiment, a magnetic recording apparatus includes: an information recording module configured to record a predetermined number of lines of information with a predetermined length in an information recording region of a magnetic recording medium, each of the lines of information having a same recording start position with respect to a relative movement direction of the magnetic recording medium and a recording element, the each of the lines of information being provided with an overlaying portion of adjacent lines of information. The information recording module is configured to record clock information in one or a plurality of the lines of information. | 04-21-2011 |
20110026160 | SERVO PATTERN WRITING METHOD, CONTROL CIRCUIT, AND MAGNETIC DISK APPARATUS - According to one embodiment, a servo pattern writing method includes: moving a head from a first one of innermost and outermost circumferences of a medium to the remainder other than the first one while controlling a position of the head in accordance with a temporary pattern preliminarily written on the medium; calculating a junction between a servo pattern to be written from the innermost circumference and a servo pattern to be written from the outermost circumference based on a movement distance of the head; first writing the servo pattern from a second one of the innermost and outermost circumferences to the junction, while controlling the position of the head in accordance with the temporary pattern; and second writing the servo pattern from the remainder other than the second one to the junction, while controlling the position of the head in accordance with the temporary pattern. | 02-03-2011 |
20110013310 | RECORDING MEDIUM DRIVING DEVICE AND MAGNETIC RECORDING MEDIUM, AND METHOD FOR CONTROLLING FLYING HEIGHT OF HEAD ELEMENT - According to one embodiment, a recording medium driving device includes: a recording medium including a plurality of groove regions and land regions, wherein each of the groove regions is formed in a groove formed on top surface of the recording medium and having an arrangement of a magnetic domain formed for each bit, and each of the land regions forms a flat surface on the top surface of the recording medium and in between a pair of the groove regions in adjacency; a head slider disposed to face the top surface of the recording medium; a head element mounted on the head slider; a heater mounted on the head slider and configured to cause a projection in the head element by heat; and a control circuit configured to cause the projection to contact with the land region at time of performing zero calibration for the projection. | 01-20-2011 |
20110004725 | DATA STORAGE DEVICE AND METHOD - According to one embodiment, a data storage device, includes: a recording medium, statuses of storage areas of the recording medium being managed by groups; a managing table storage module storing a managing table in which bit information pieces are associated to indexes representing the groups, the bit information pieces indicating the statuses of the storage areas initially set to an erased status; a transfer controller storing, upon receiving a write command, data in the storage areas; and a controller updates the bit information pieces of one of the groups to which the storage areas belongs to a stored status. Upon receiving an erase command, the transfer controller overwrites the storage areas by predetermined data. The main controller is configured to update the bit information pieces to the erased status. | 01-06-2011 |
20110002066 | ACTUATOR ARM AND DISK RECORDING DEVICE - According to one embodiment, an actuator arm includes a joint, an extension, a pair of outer surfaces, and a linear protrusion. The joint is rotatably supported on a shaft. The extension extends from the joint and has a tip end connected to a head that performs at least reading or writing with respect to a rotating disk recording medium. The outer surfaces are in a front-and-rear relationship with each other. At least one of the outer surfaces faces the disk recording medium. The linear protrusion is arranged on and extends along an edge of at least one of the outer surfaces. The edge is located upstream on the outer surfaces in a flowing direction of an air flow generated by the rotation of the disk recording medium. | 01-06-2011 |
20100332844 | MAGNETIC DISK DEVICE AND COMMAND EXECUTION METHOD FOR MAGNETIC DISK DEVICE - According to one embodiment, a magnetic disk device includes a receiver, an encrypting-and-decrypting module, a read-and-write controller, a setting module, an order controller, an executing module. The receiver receives a command to write data to or read data from a recording medium segmented into a plurality of storage areas each corresponding to an encryption key. The command causes an access to at least one of the storage areas. The encrypting-and-decrypting module encrypts the data or decrypts the data using the encryption key. The read-and-write controller controls writing the data to the recording medium and reading data therefrom. The setting module sets the encryption key corresponding to the storage area accessed by the command to the encrypting-and-decrypting module. The order controller controls the execution order in which commands are executed and brings up the execution order of the command causing an access to the storage area. The executing module executes the commands in the execution order. | 12-30-2010 |
20100328812 | MAGNETIC DISK DEVICE - According to one embodiment, a magnetic disk device includes a receiver, a storage module, a determining module, and a prescanner. The receiver receives a command from a host device. The storage module stores, with respect to each of divided areas formed by dividing the recording area of a recording medium into a plurality of areas, pre-scan control information indicating at least one of the receiving time and the number of receiving times. The receiving time indicates a time at which a write command is received. The number of receiving times indicates the number of times the write command is received within a predetermined period after the power is turned on. The determining module determines the order in which pre-scan is performed on the divided areas based on at least one of the receiving time and the number of receiving times. The prescanner pre-scans the divided areas in the determined order. | 12-30-2010 |
20100328804 | MAGNETIC DISK STORAGE DEVICE AND METHOD CONTROLLING OF MAGNETIC DISK STORAGE DEVICE - According to one embodiment, a magnetic disk storage device includes a magnetic disk, a head, a clock generator, an estimating module, and a controller. The magnetic disk includes a servo area and a corresponding data area, and has a surface divided into zones in the radial direction. The basic frequency varies in the servo area depending on the zones. The head is driven to read a signal from the magnetic disk. The clock generator generates a clock signal for decoding a signal read from the data area corresponding to the servo area based on a signal read from the servo area. The estimating module estimates the position of the servo area in the radial direction, from which the head reads a signal next. The controller controls the clock generator to generate a clock signal of the basic frequency before the head reaches the servo area based on the estimated position. | 12-30-2010 |
20100328801 | DISK DRIVE - According to one embodiment, a disk drive includes a disk medium, a read controller configured to perform a read control for information in the disk medium, a determiner configured to determine whether or not to ignore a read error in information as a read target depending on a type of the information, and a transmitter configured to transmit the information to a host device without read error detection for the information read by the read controller if the determiner determines to ignore the read error. | 12-30-2010 |
20100315746 | HEAD GIMBAL ASSEMBLY AND FIXING METHOD OF BASE PLATE AND CARRIAGE ARM - According to one embodiment, a head gimbal assembly includes: base plate body; flexure; through hole passing through the base plate body; cylindrical base that upstands from the front surface of the base plate body, and has a first inner diameter; a cylindrical flange that continues to the base around the through hole and has a second inner diameter smaller than the first inner diameter; and inner wall surface that is defined by the flange and extends along a cylindrical surface formed by a generating line parallel to a central axis of the through hole. A ratio of a thickness T of the flange defined along a virtual plane orthogonal to the central axis of the through hole to a length L of the inner wall surface defined in a direction parallel to the central axis of the through hole is set to 1.5 or less. | 12-16-2010 |
20100302675 | STORAGE MEDIUM AND METHOD AND PROGRAM FOR DETECTING TRACK POSITION OF STORAGE MEDIUM - According to one embodiment, a storage medium that stores position information indicating positions of a plurality of tracks in a radial direction in the tracks, wherein the position information includes: a first pattern in which a feed angle indicating a phase difference between the tracks is an angle obtained by adding a predetermined angle to +90°; a second pattern in which the feed angle is an angle obtained by adding the predetermined angle to −90°; and a third pattern in which the feed angle is the same as that of the first pattern. | 12-02-2010 |
20100302671 | MAGNETIC RECORDING DEVICE, HEAD EVALUATION DEVICE, AND WRITE-POLE-ERASING EVALUATION METHOD - According to one embodiment, a magnetic recording device includes a write controller to control such that writing first information having a same polarity throughout the first information in a predetermined region including a plurality of tracks in a recording medium, writing second information in a target track located within or close to the predetermined region, and writing third information having, at an end of the writing, a polarity opposite to the polarity of the first information in a region of the target track in which the second information is not written, are performed; a read controller to control such that the second information is read after each of writing of the second information and writing of the third information; and a determiner to determine occurrence of pole erasing based on each second information read under the control by the read controller. | 12-02-2010 |
20100296379 | ERROR CORRECTING CIRCUIT AND DISK STORAGE DEVICE - According to one embodiment, an error correcting circuit includes: a marker decoder configured to sample 2-bit markers from a data string and, from a plurality of sample values of the 2-bit markers, determine whether there is an occurrence of an error on the 2-bit markers, of an insertion error, or of a deletion error; and an error correcting module configured to perform first error correction on the data string received from the marker decoder by using an error correcting code in the data string. When either one of the insertion error and the deletion error is determined to have occurred, the marker decoder is configured to perform second error correction on the either one of the insertion error and the deletion error, and output the data string from which the 2-bit markers are removed. | 11-25-2010 |
20100293418 | MEMORY DEVICE, DATA TRANSFER CONTROL DEVICE, DATA TRANSFER METHOD, AND COMPUTER PROGRAM PRODUCT - According to one embodiment, a memory device includes: a driving module configured to store therein data on a sector-by-sector basis; a first verifying module configured to verify, during a reading operation, sector data from the driving module; a partitioning module configured to partition the sector data into sets of subsector data, a size of each set of subsector data being smaller than a size of the sector data; an appending module configured to append an error detecting code to each set of subsector data; a second verifying module configured to store, in a predetermined memory, the sets of subsector data retrieved from a buffer, and to verify the sets of subsector data using respective error detecting codes; and a sending module configured to send, from the memory, the verified sets of subsector data to the host with a transfer size. | 11-18-2010 |
20100284112 | HEAD SUSPENSION UNIT, HEAD SUSPENSION ASSEMBLY, AND STORAGE DEVICE - According to one embodiment, a head suspension unit includes: a head suspension; a thin plate body of a flexure attached to a surface of the head suspension and holding an insulating layer on the surface thereof; a wiring pattern formed on a surface of the insulating layer and forming a hollow conductor defining a hollow space extending along the surface of the insulating layer; and an insulating material filling the hollow space. | 11-11-2010 |
20100268354 | POSITION CONTROL METHOD, POSITION CONTROL DEVICE, AND MEDIUM STORAGE DEVICE HAVING DISTURBANCE SUPPRESSION FUNCTION - In a position control device having a disturbance suppression function, loop gain is calibrated without stopping disturbance suppression control. The position control device has, for disturbance suppression control, a feedback controller for changing the loop characteristic, a table for storing a target gain according to a disturbance frequency, and a gain calibration section for calibrating open loop gain. The gain is calibrated using a target gain in the table according to the change of the loop characteristic of the feedback controller. Open loop gain can be calibrated without interrupting the disturbance suppression control, so the open loop gain can be accurately calibrated without being affected by disturbance, and accurate position control is possible. | 10-21-2010 |
20100265619 | MAGNETIC STORAGE MEDIUM AND MAGNETIC STORAGE DEVICE - According to an embodiment, a magnetic storage medium includes a data area in and from which a magnetic head on a magnetic head slider records and reproduces data, the data area including an innermost peripheral radius Rid [m] and an outermost peripheral radius Rod [m]. If a rotational speed during recording and reproduction of the data is RPS [rps], waviness of the storage medium with a wavelength in a range between λ | 10-21-2010 |
20100265616 | MAGNETIC RECORDING HEAD AND MAGNETIC STORAGE DEVICE - According to one embodiment, a magnetic recording head includes a flying surface and an exposed surface exposed on the flying surface. The exposed surface is defined by oblique sides and a lower side of a trapezoid having an upper side on the trailing side, and a contour line. The lower side on the leading side extends in parallel to the upper side and is shorter than the upper side. The contour line extends from one end to the other end of the upper side and rises from the upper side towards the trailing side between extended lines of the oblique sides. | 10-21-2010 |
20100265615 | STORAGE DEVICE - According to one embodiment, a storage device includes a clamp ring on a disc, configured to fix the disc to a spindle motor configured to rotate the disc, and a screw configured to fix the clamp ring to the spindle motor, and includes a screw-head and a recess in the screw-head, a center of the recess being decentered from a center of the screw-head. | 10-21-2010 |
20100259850 | STORAGE DEVICE AND METHOD OF DETERMINING HEAD SLIDER CONTACT - According to one embodiment, a storage device includes a recording medium, a head slider, a head suspension, an actuator, and an alternating current component generator. The head slider faces a surface of the recording medium. The head suspension supports the head slider. The actuator is incorporated in the head slider and increases the protruding length of a protrusion formed on the head slider toward the surface of the recording medium based on an increase in a supplied electrical signal. The alternating current component generator superimposes an alternating current component having a frequency equal to the natural frequency of the head suspension over the electrical signal while increasing or decreasing the protruding length of the protrusion at a predetermined amplitude. | 10-14-2010 |
20100259848 | METHOD AND CIRCUIT FOR HEAD FLYING HEIGHT CONTROL, AND MAGNETIC STORAGE DEVICE - According to one embodiment, there is provided a head flying height control method for controlling a flying height of a magnetic head from a magnetic storage medium. The magnetic head includes an element portion and a heater that effects a change in a protrusion amount of the element portion due to thermal expansion accompanying heat generation. The head flying height control method includes: causing the element portion to protrude a maximum protrusion amount by increasing a heater power of the heater; first-reducing the heater power based on a relation between the protrusion amount and the heater power until the protrusion amount becomes a predetermined protrusion amount; and second-reducing, if a head-medium property is better than a target value after the first-reducing, the heater power based on a relation between the head-medium property and the heater power so that the head-medium property matches the target value. | 10-14-2010 |
20100254037 | INFORMATION PROCESSING SYSTEM AND METHOD FOR ACCESSING INFORMATION PROCESSING DEVICE - According to one embodiment, an information processing system includes a plurality of information processing devices connected to one another and capable of transmitting/receiving data to/from one another. One information processing device includes a determiner configured to determine whether an address level included in a transmission signal transmitted from another information processing device is for specifying the one information processing device based on information on the address level, and a data receiver configured to receive real data included in the received transmission signal when the determiner determines that the address level is for specifying the one information processing device. The another information processing device includes an address-data converter configured to convert address data for specifying the one information processing device to a corresponding address level, and a transmitter configured to transmit the transmission signal including information on the address level obtained by the address-data converter and the real data for the one information processing device. | 10-07-2010 |
20100246071 | HEAD SUSPENSION ASSEMBLY AND MAGNETIC DISK DRIVE - According to one embodiment, a head suspension assembly includes a load beam supporting a head, and a microactuator configured to swing the load beam. The microactuator includes two piezoelectric elements configured to undergo shear deformation when supplied with a voltage and juxtaposed in such a manner that respective shear deformations thereof are opposite in direction, a first electrode and a second electrode arranged so as to hold the piezoelectric elements therebetween, and a support plate joined to the first electrode with an insulating layer therebetween and joined to the load beam to support the load beam. | 09-30-2010 |
20100246066 | HEAD SLIDER, STORAGE DEVICE, AND METHOD OF MANUFACTURING HEAD SLIDER - According to one embodiment, a head slider includes an element unit formed by lamination on a substrate, a cut surface formed by cutting the substrate, an air-bearing surface configured to face a recording medium when in flight, a protective layer configured to protect at least the air-bearing surface of the element unit, and a coating layer configured to cover at least the cut surface exclusive of the air-bearing surface of the element unit. An outermost surface of the air-bearing surface is formed of the protective layer in the element unit at the least. | 09-30-2010 |
20100246059 | STORAGE DEVICE - According to an embodiment, a storage device includes a housing configured to contain a magnetic disk storage medium, a drive section configured to rotate the storage medium to store information into the storage medium, an air passage which is defined along an outer peripheral edge of the storage medium between the outer peripheral edge and a wall portion of the housing which faces the outer peripheral edge, receives air produced as the storage medium rotates, and discharges the received air toward an outer peripheral surface of the storage medium, a filter for dust collection in the air passage, and a spoiler located close to at least an air exhaust side of the air passage and extending from the outer peripheral edge side of the storage medium to a region above a recording surface of the storage medium. | 09-30-2010 |
20100246053 | STORAGE DEVICE AND RAMP MECHANISM - According to one embodiment, a storage device has a head configured to read or write data with respect to a storage medium above the storage medium; a head suspension configured to support the head; a lift tab extending from an end on a head side of the head suspension; and a ramp mechanism configured to hold the lift tab at a retracted position spaced apart from the recording medium. The ramp mechanism has: a rotating shaft; and a disk rotatably supported by the rotating shaft and configured to rotate in a retracting direction by coming into contact with the lift tab that is retracting with the head from above the recording medium, and to guide and retract the lift tab to the retracted position. | 09-30-2010 |
20100246050 | STORAGE DEVICE - According to one embodiment, a storage device includes a base, a drive section on the base, configured to rotate a disk storage medium, an actuator mounted with a head for processing data in the storage medium and configured to move the head along a surface of the storage medium, a cover laid over the base, and a plate opposed to the surface of the storage medium in a position outside a range of movement of the actuator. The plate includes a distal end portion located adjacent to the actuator and downstream with respect to a direction of rotation of the storage medium, a block extending from the distal end portion, located outside the outer periphery of the storage medium, and supported on the base side, and an elastically deformable plate arm extending from the block toward the cover and configured to abut an inner surface of the cover. | 09-30-2010 |
20100246047 | MAGNETIC HEAD AND INFORMATION STORAGE DEVICE - According to one embodiment, a magnetic head includes a magnetic pole layer including a magnetic pole extending along a layer, a coil layer configured to adjoin the magnetic pole layer and including a plurality of conductor patterns constituting a part of a coil wound around the magnetic pole and a resin which fills up a gap between the conductor patterns, a heater layer configured to adjoin the coil layer and including a heater extending in the heater layer via an area along a coil-forming region in which the conductor patterns in the coil layer are formed and an area along a no-coil region off the coil-forming region, and a transition-reluctant portion in that part of the no-coil region which adjoins the heater and having a glass transition temperature higher than that of the resin or not having any glass transition temperature. | 09-30-2010 |
20100244635 | PIEZOELECTRIC ELEMENT AND METHOD OF MANUFACTURING THE SAME - According to one embodiment, a piezoelectric element is provided by forming a first electrode film on a major surface of a substrate, forming a modified film by modifying at least a portion of the major surface of the substrate by heating the substrate in an ambient containing oxygen, and forming a piezoelectric film by depositing a piezoelectric material on the first electrode film, forming a second electrode film on the piezoelectric film, adhering a support on the second electrode film, and peeling off a multilayered structure including at least the first electrode film, the piezoelectric film, the second electrode film, and the support from the substrate. | 09-30-2010 |
20100241922 | ERROR CORRECTION CIRCUIT AND DATA STORAGE DEVICE - According to one embodiment, a circuit includes: an ECC encoder to assign symbols of a data string to M interleaves in sequence, create redundancy symbols for each interleaved string, insert the redundancy symbol into the data string every N symbols of the data string, and create ECC encoded data, where M and N are greater than or equal to 2; and an ECC decoder to assign the symbols of the data string that has been inserted with the redundancy symbols to M interleaves and apply error correction to each assigned string, using the redundancy symbols of that assigned string. The encoder assigns each symbol of the data string that corresponds to an insertion position of the different one of the redundancy symbols in the data string to a next position next to and skipping an in-sequence interleaving position of that symbol, and creates the redundancy symbols for each interleaved string. | 09-23-2010 |
20100241870 | CONTROL DEVICE, STORAGE DEVICE, DATA LEAKAGE PREVENTING METHOD - According to one embodiment, a control device controls a storage device configured to encrypt data based on an encryption key, store the data in a storage region, and decrypt the data stored in the storage region based on the encryption key. The control device includes an information generator and an encryption key generator. The information generator generates information as change information when the storage device is turned on. The change information is different from information used when the storage device is last turned on. The encryption key generator generates an encryption key based on the change information generated by the information generator. | 09-23-2010 |
20100241643 | MAGNETIC DISK DEVICE AND METADATA MANAGEMENT SYSTEM - According to one embodiment, a magnetic disk device includes: a recording medium configured to record a plurality of metadata items for each of search data items, the metadata items being related to information of the search data items; a management module configured to manage, for each of the metadata items, logical addresses specifying the metadata items recorded in the recording medium; and a reader configured to read the metadata items from the recording medium by using the logical addresses managed by the management module. | 09-23-2010 |
20100238594 | HEAD SUSPENSION ASSEMBLY AND STORAGE DEVICE - According to one embodiment, a head suspension assembly includes: a metal thin plate held by a head suspension; a fixed plate formed in the metal thin plate and joined to the head suspension; a supporting plate formed in the metal thin plate on the front side of the fixed plate and supporting a head slider on a surface thereof and held on a rear surface thereof by a protrusion formed on the head suspension; an arm formed in the metal thin plate and extending from the fixed plate to the supporting plate and allowing a change in a posture of the supporting plate; an insulating layer extending from the fixed plate to the supporting plate and supported by the arm; a wiring pattern formed on the insulating layer; and a visco-elastic body arranged on a flat surface formed on the arm, the insulating layer, or the wiring pattern. | 09-23-2010 |
20100238593 | HEAD STACK ASSEMBLY INCORPORATING DEVICE, MAGNETIC DISK DEVICE MANUFACTURING DEVICE, AND METHOD OF MANUFACTURING MAGNETIC DISK DEVICE - According to one embodiment, a head stack assembly incorporating device connects a head stack assembly to the base of a magnetic disk device by screwing a connector on the bottom surface of the rotational shaft of the head stack assembly and a connector on the base of the magnetic device together. The head stack assembly incorporating device includes a chuck and a driving-force transmitter. The chuck pinches the rotational shaft of the head stack assembly from the upper surface of the head stack assembly to be fixed to the rotational shaft. The chuck is rotatable around the central axis of the rotational shaft. The driving-force transmitter transmits a rotational force to the chuck. | 09-23-2010 |
20100238592 | HEAD SLIDER AND MAGNETIC STORAGE DEVICE - According to one embodiment, a head slider includes a magnetic head, a medium facing surface, a flow-in end surface, a flow-out end surface, side surfaces, and an absorbing structure. The magnetic head reads and writes information with respect to a magnetic recording medium. The medium facing surface faces the magnetic recording medium. From the flow-in end surface, an airflow generated by rotation of the magnetic recording medium flows in. To the flow-out end surface, the airflow is guided from the flow-in end surface through the medium facing surface. The side surfaces are located on both sides of the medium facing surface. The absorbing structure is provided to at least one of the flow-out end surface and the side surfaces. The absorbing structure absorbs flowing substances guided with the airflow. | 09-23-2010 |
20100238586 | ARRANGEMENT METHOD OF SERVO PATTERN OF PATTERNED MEDIUM, PATTERNED MEDIUM, AND INFORMATION STORAGE DEVICE - According to one embodiment, address information is expanded on a bit map in order to generate original address information which is divided in a direction of the abscissa to form groups. The demodulated values of the original address information are obtained as original intra-group demodulated values. New address information is obtained and an arrangement pattern of bits in the servo area determined based on the new address information on a bit map formed by integrating obtained new address information items of the groups. | 09-23-2010 |
20100238583 | DISK DEVICE - According to one embodiment, a disk device rotates a disk information storage medium to record and reproduce information on the information storage medium by use of a head that slides in contact with a lubricant coated on the information storage medium, wherein a sliding speed U, area A and normal force N are set to cause U×A/N to fall within a monotonously increasing region in which a coefficient of friction associated with a frictional force occurring in a contact area of the head that faces the information storage medium monotonously increases as U×A/N increases, where the sliding speed U represents a sliding speed at a sliding time of the head, the area A represents the contact area of the head, and the normal force N represents a normal force applied to the contact area of the head. | 09-23-2010 |
20100238582 | DISK APPARATUS WITH CONTACT-TYPE HEAD - According to one embodiment, a disk drive comprises a head and a heating actuator. The head is configured to slide over a rotating disk in contact with a surface of the disk. The heating actuator is configured to vary a state of contact between the head and the disk by being expanded by supplied heat. The head comprises the heating actuator. | 09-23-2010 |
20100238579 | MAGNETIC STORAGE DEVICE, METHOD FOR SETTING PROCESSING CONDITIONS FOR MAGNETIC STORAGE DEVICE, AND COMPUTER PROGRAM PRODUCT FOR SETTING PROCESSING CONDITIONS FOR MAGNETIC STORAGE DEVICE - According to one embodiment, a magnetic storage device, includes: a verification processing detector configured to detect whether there are a plurality of operation commands corresponding to a first verifying operation, based on a plurality of sets of individual information about the operation commands for the magnetic storage device from an external device, the sets of individual information including execution times and sets of accessed address information, the sets of individual information being stored in a first storage module as history information; and a processing condition setting module configured to set processing conditions for a second verifying operation to verify data stored in the first storage module, based on the sets of individual information corresponding to the first verifying operation, when the operation commands are detected. | 09-23-2010 |
20100238578 | METHOD FOR GENERATING WRITE CLOCK SIGNAL IN MAGNETIC DISK DRIVE - According to one embodiment, a write clock generator writes data to bits in a magnetic recording medium based on a write clock signal with a phase obtained by delaying the phase of a reference write clock signal. The write clock generator detects the amplitude of a read signal for the written data. The write clock generator repeats these operations with a phase delay varied. The write clock generator decides an optimum phase delay based on the amplitude detected for each phase delay. | 09-23-2010 |
20100238577 | METHOD AND APPARATUS FOR MEASURING PHASE SHIFT IN A DISK DRIVE HAVING BIT-PATTERNED MEDIA - According to one embodiment, a disk drive comprising a magnetic disk of bit-patterned type is provided. The disk drive has a reproduction module, a measurement module, and a recording module. The reproduction module outputs a reproduced signal corresponding to the phase-shift measuring bits provided on the magnetic disk. The measurement module determines that the phase shift corresponding to the phase-shift measuring bits is the phase shift of a write clock signal if the reproduced signal is determined to be indefinite on the basis of the quantization value of the reproduced signal. The recording module records data corresponding to the data recording bits, by using the write clock signal adjusted by the phase shift. | 09-23-2010 |
20100238576 | MAGNETIC BIT-PATTERNED DISK AND DISK DRIVE - According to one embodiment, a disk drive having a magnetic disk of the bit pattern media type is provided. The disk drive has a reproduction module configured to reproduce a signal from a measurement area provided on the magnetic disk and holding groups of phase-shift measuring bits, a measurement module configured to measure a phase shift that a write clock signal has with respect to data recording bits held in a data record area provided on the magnetic disk, when the signal reproduced by the reproduction module is indefinite, and a recording module configured to record data that corresponds to the data recording bits, by using the write clock signal adjusted by the phase shift. | 09-23-2010 |
20100236070 | BEARING ASSEMBLY METHOD AND PRESSURIZATION JIG - According to one embodiment, a bearing assembly method for providing a bearing between a shaft and a rotator, comprises: embedding the bearing between the shaft and the rotator, and supplying a first adhesive between an inner ring of the bearing and the shaft and a second adhesive between an outer ring of the bearing and the rotator; partially pressing a plurality of points on an end surface of the inner ring before the first adhesive and the second adhesive are cured; and finishing pressing when the first adhesive and the second adhesive are cured. | 09-23-2010 |
20100235568 | STORAGE DEVICE USING NON-VOLATILE MEMORY - According to one embodiment, a storage device includes a plurality of writable non-volatile memory devices, a buffer memory, a memory controller, and a spare non-volatile memory device. The buffer memory temporarily stores write data from a host. The memory controller writes the write data in the buffer memory to the non-volatile memory devices in a distributed manner. The memory controller writes write data in the buffer memory not having been written to the non-volatile memory devices to the spare non-volatile memory device when detecting a power down, and writes the write data having been written to the spare non-volatile memory device to the buffer memory when the power is restored. | 09-16-2010 |
20100232071 | PERPENDICULAR MAGNETIC RECORDING MEDIUM, METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING/PLAYBACK APPARATUS - According to one embodiment, a magnetic head includes a slider, a recording/reproduction element formed on a distal end face of the slider, and a resin film formed at least on the recording/reproduction element and the distal end face and having at least one of water repellency and oil repellency. | 09-16-2010 |
20100232048 | DISK STORAGE DEVICE - According to one embodiment, a disk storage device includes: a controller configured to write data pieces stored in a buffer memory to a disk medium by a physical sector size which is an integer multiple of a unit logical block, wherein the controller is configured to detect at least one of the write data pieces stored in the buffer memory, the at least one of the write data pieces being to be written to a portion of a physical sector of the disk medium, configured to store the at least one of the write data pieces to the non-volatile memory, configured to store the rest of the write data pieces to the disk medium, and configured to write, upon non-detection of a command for a predetermined time period, the at least one of the write data pieces to the disk medium by the physical sector size through read-modify-write processing. | 09-16-2010 |
20100226044 | HEAD SLIDER AND STORAGE MEDIUM DRIVING DEVICE - According to one embodiment, a head slider, includes: a slider main body; an insulating nonmagnetic film laminated on an end surface of the slider main body at an air outflow side; a head element embedded in the nonmagnetic film; a heater embedded in the nonmagnetic film in association with the head element; a conductive terminal formed on an end surface of the nonmagnetic film at the air outflow side; a conductive pattern configured to electrically connect the heater and the conductive terminal with each other; and a radiator configured to contact the conductive pattern and dissipate heat transmitted from the conductive pattern. | 09-09-2010 |
20100226036 | DISK DRIVE HAVING MAGNETIC DISK OF PATTERNED MEDIA TYPE - According to one embodiment, a magnetic disk of a patterned media type, has a plurality of zones divided in radial direction on a magnetic recording surface. A plurality of segments which are included in each of the zones includes a data recording area composed of data recording unit of magnetic material and a first resync area in which a reference signal pattern for setting the timing of writing data in the data recording area has been recorded. The number of segments included in each of the zones is an integer and has a common divisor. | 09-09-2010 |
20100226034 | MAGNETIC HEAD, MAGNETIC DISK DEVICE, AND MANUFACTURING METHOD OF MAGNETIC HEAD - According to one embodiment, a magnetic disk device includes a magnetic disk, a slider opposed to the magnetic disk, and a magnetic head on the slider. The magnetic head includes a head element configured to carry out recording or reproduction, a heating element configured to thermally protrude the element, and a groove configured to partition a peripheral area of the head element in a direction in which the head element are to protrude. | 09-09-2010 |
20100226032 | CONTROL DEVICE, MAGNETIC DISK DEVICE, AND IW SENSITIVITY CALCULATING METHOD - According to one embodiment, a control device includes a writer, a setting module, a reader, and an Iw sensitivity acquiring module. The writer writes a signal by the magnetic head. The setting module sets an electric parameter to the magnetic head. The reader reads the signal by the magnetic head. The Iw sensitivity acquiring module acquires Iw sensitivity of the magnetic head. The Iw sensitivity acquiring module includes a first acquiring module, a second acquiring module, and an Iw sensitivity calculator. The first acquiring module acquires a predetermined output value related to control of a signal having a predetermined frequency. The second acquiring module acquires a predetermined output value related to control of the signal having the predetermined frequency. The Iw sensitivity calculator calculates the Iw sensitivity of the magnetic head based on the predetermined output values acquired by the first and second acquiring modules. | 09-09-2010 |
20100225310 | TOUCH-DOWN DETERMINING DEVICE, TOUCH-DOWN DETERMINING METHOD, AND MAGNETIC DISK DEVICE - According to one embodiment, a touch-down determining device, includes: an alternating current perturbation module configured to periodically perturb power of a heater by an alternating current, the heater adjusting protrusion amounts of a write magnetic pole and a read element of a magnetic head in a direction towards a recording medium; a change detector configured to detect a change in a spectrum level of a portion of a spectrum of a read signal read from the recording medium by the magnetic head receiving the power perturbed by the alternating current, the portion of the spectrum corresponding to the alternating current; and a touch-down determining module configured to determine whether touch-down is made, based on the change in the spectrum level detected by the change detector. | 09-09-2010 |
20100220413 | SLIDER SUPPORT MECHANISM, SPRING FORCE CONTROL METHOD AND SPRING FORCE CONTROLLER - According to one embodiment, a slider support mechanism includes a flexure includes a distal end portion on a front side mounted with a slider includes a magnetic head configured to record/reproduce data on/from a recording medium, a hinge plate configured to produce spring force urging the slider toward the recording medium, a load beam joined to a front portion of the hinge plate, and a base plate joined to a rear portion of the hinge plate. The flexure comprises a front portion on a back side joined to the load beam, a rear portion on the back side joined to at least one of the rear portion of the hinge plate and the base plate, and a control mechanism configured to control the spring force. | 09-02-2010 |
20100220409 | MAGNETIC STORAGE MEDIUM, INFORMATION STORAGE DEVICE, AND CONTROL DEVICE - According to one embodiment, a magnetic storage medium, includes a magnetic recording layer that includes: a servo area including predetermined servo information; a user data area including predetermined user information; two preamble areas including a plurality of magnetic bodies made of magnetic particles, the magnetic bodies being arranged in a staggered pattern so that the staggered pattern is inverted with respect to an axis of symmetry at a track center; and a re-sync mark area positioned at a head of the preamble areas and indicates a start of the preamble areas. | 09-02-2010 |
20100217923 | STORAGE DEVICE WITH FLASH MEMORY - According to one embodiment, a write detector detects a predetermined state where a flash memory contains an area to which write data subject to a write request from a host is to be written and from which data has been erased. A data reception controller allows a data buffer to receive the requested write data in accordance with the detection of the predetermined state. | 08-26-2010 |
20100214687 | STORAGE DEVICE AND READ/WRITE PROCESSING METHOD THEREFOR - According to one embodiment, a storage device includes: a control circuit configured to perform a write retry when data writing fails, wherein the control circuit recognizes that read commands are issued at regular intervals for reproducing continuous pieces of data, and upon detecting an error requiring the write retry to be performed in the data writing by a write command received during the reproduction, the control circuit interrupts the data writing, perform data reading to store the data in the buffer memory after allocating a storage area for the data in the buffer memory, and then resumes the data writing. | 08-26-2010 |
20100208382 | RECORDING MEDIUM DRIVE AND METHOD FOR CONTROLLING TEMPERATURE OF RAMP MEMBER FOR RECORDING MEDIUM DRIVE - According to one embodiment, a recording medium drive includes a housing, a recording medium, a head actuator member stored in the housing reciprocatably about a shaft, and facing the recording medium at one end, a load tab on the end of the head actuator member, a ramp member fixed in the housing at an outer side of the recording medium, and defining a sliding surface that receives sliding of the load tab, a heater increasing a temperature of the ramp member based on a supplied driving current, a temperature sensor detecting a temperature inside the housing and outputting temperature information, a memory storing profiles of the driving current each set for a predetermined temperature range, and a control circuit supplying a predetermined value of driving current to the heater based on one of the profiles corresponding to the temperature information. | 08-19-2010 |
20100202608 | ENCRYPTION DEVICE, DECRYPTION DEVICE, AND STORAGE DEVICE - According to one embodiment, an encryption device uses N extended keys (N: a natural number not less than 2) obtained by extending one encryption key, and includes a first memory, a comparison circuit, a second memory, a selector, and an extension calculator. The first memory stores a flag corresponding to an initial value of a key. The comparison circuit outputs a signal indicating comparison matching when a command and the key are related to encryption. The selector loads the key in the first memory into the second memory upon receiving the signal. The extension calculator calculates the extended keys based on the key in the second memory and inputs them to the selector. Except when loading the initial value of the key into the second memory, the selector loads the extended keys into the second memory to extend the encryption key to from the first to N-th extended keys. | 08-12-2010 |
20100202475 | STORAGE DEVICE CONFIGURED TO TRANSMIT DATA VIA FIBRE CHANNEL LOOP - According to one embodiment, an arbiter transmits its own arbitration signal from a port to a fibre channel loop in order to acquire a possessory right for the fibre channel loop when a data transmission request has occurred at the port. A detector detects a latency time from when its own arbitration signal is transmitted until the possessory right is acquired. A frame transmitter transmits a frame with a burst length corresponding to the detected latency time from the port to a destination via the fibre channel loop. | 08-12-2010 |
20100202086 | STORAGE DEVICE AND DESIGN METHOD THEREOF - According to one embodiment, a storage device includes a spindle assembly including a spindle motor configured to rotate a disk, and a clamp ring configured to fix the disk to the spindle motor, and a slider with a head configured to read/write data on/from the disk, and configured to fly over a surface of the rotating disk. The slider includes a trailing edge on a floating surface of the slider opposed to the disk, and the trailing edge is an end part through which an airflow exits. The spindle assembly and the slider are configured to satisfy a relationship of 0.95f≦F≦1.05f at a temperature of 23° C., where f is an anti-resonance frequency of the trailing edge, and F is a resonance frequency of the spindle assembly. | 08-12-2010 |
20100202078 | READ/WRITE PROCESSING METHOD FOR MEDIUM RECORDING DEVICE AND MEDIUM RECORDING DEVICE - According to one embodiment, a medium recording device includes a reading/writing module configured to read/write data from/to a recording medium, a buffer memory configured to temporarily store the read data and data from a host, and a controlling circuit configured to, in response to a read command, read data from the buffer memory or the recording medium to transfer the data to the host, and in response to a write command, to store data from the host in the buffer memory, to write the data onto the recording medium, and to execute a write retry when writing fails. The controller circuit recognizes a read command issued by the host at a fixed interval for replaying continuous data, and determines whether write in response to a write command received during the replaying is likely to fail, and when the write is likely to fail, permits a reception of the read command issued at the fixed interval. | 08-12-2010 |
20100201347 | VOLTAGE MEASURING DEVICE AND STORAGE DEVICE - According to one embodiment, a voltage measuring device that measures an input voltage signal includes a divider, a filter, an adder, and an analog-to-digital converter. The divider divides the input voltage signal into a first signal and a second signal. The filter filters the first signal and attenuates a direct current component of the first signal less than a predetermined frequency component of an alternating current component of the first signal. The adder adds an output signal of the filter to the second signal. The analog-to-digital converter converts an output signal of the adder into a digital signal. The divider adjusts the amplitude of at least one of the first signal and the second signal such that the level of a direct current component of the output signal of the adder is in the input range of the analog-to-digital converter. | 08-12-2010 |
20100199005 | COMMUNICATION INTERFACE CIRCUIT, ELECTRONIC DEVICE, AND COMMUNICATION METHOD - According to one embodiment, an interface comprises establishing a connection to a communicatee device, transmitting a connection maintenance signal to the communicatee device, and decreasing a maximum amplitude of the connection maintenance signal from a first amplitude, establishing a connection to the communicatee device again when communication is disabled, and transmitting the connection maintenance signal to the communicatee device, and setting the maximum amplitude of the connection maintenance signal to a second amplitude which is larger than the maximum value of the connection maintenance signal obtained when the communication is disabled by a predetermined value. | 08-05-2010 |
20100195473 | SIGNAL TRANSMISSION CIRCUIT AND STORAGE DEVICE - According to one embodiment, a signal transmission circuit includes: a first electro optical converter converting a read electric signal to a first optical signal having an optional wavelength λR; a first photo-electric converter configured to reconvert the first optical signal to the read electric signal; a second electro optical converter converting a electric signal to be recorded to a second optical signal having a wavelength λW different from the λR; a second photo-electric converter reconverting the second optical signal to the electric signal to be recorded; a first optical multiplexer/demultiplexer connected to the first electro optical converter and the second photo-electric converter, and multiplexing and demultiplexing the first and second optical signals; a second optical multiplexer/demultiplexer multiplexing and demultiplexing the first and second optical signals; and an optical transmission medium connected to the first and second optical multiplexers/demultiplexers, and transmits the multiplexed first and second optical signals. | 08-05-2010 |
20100195251 | MICRO ACTUATOR DEVICE, HEAD SUSPENSION ASSEMBLY AND STORAGE MEDIUM DRIVING DEVICE - According to one embodiment, a micro actuator device, includes: a first piezoelectric element superposed on a first lower support plate coupled to a fixed plate; a second piezoelectric element superposed on a second lower support plate in parallel with the first lower support plate coupled to the fixed plate; a first upper support plate interposing the first piezoelectric element between the first upper support plate and the first lower support plate, and generating strain equal to strain of the first lower support plate when a tensile force of the first piezoelectric element acts on the first lower support plate; and a second upper support plate interposing the second piezoelectric element between the second upper support plate and the second lower support plate, and generating strain equal to strain of the second lower support plate when a tensile force of the second piezoelectric element acts on the second lower support plate. | 08-05-2010 |
20100191981 | STORAGE APPARATUS AND DATA FALSIFICATION PREVENTING METHOD THEREOF - According to one embodiment, a storage apparatus includes: an encryption key generation information generator configured to generate encryption key generation information used to generate an encryption key based on information from a host computer; an encryption key generator configured to generate the encryption key based on the encryption key generation information; an initialization data encryption module configured to encrypt initialization data of a storage medium received from the host computer using the encryption key; a decryption module configured to decrypt data read from the storage medium using a decryption key corresponding to the encryption key; a comparator configured to compare data decrypted by the decryption module and the initialization data; and a write processor configured to permit, when the comparator determines that the data decrypted by the decryption module and the initialization data match with each other, to write user data in the storage medium. | 07-29-2010 |
20100191944 | DATA STORAGE APPARATUS - According to one embodiment, a data storage apparatus includes: a storage element including a user data storage area and an area for storing multiplexed pre-boot authentication applications; and a controller connected to a host and performs read/write access to the user data area when an authentication by the pre-boot authentication application is verified. The controller determines whether the data storage apparatus is connected to the host in a form in which the host performs time-out monitoring or the data storage apparatus is connected to the host in a form in which the host does not perform the time-out monitoring. The controller performs, when the controller determines that the data storage apparatus is connected to the host in the form in which the host does not perform the time-out monitoring, mirroring synchronization of the multiplexed pre-boot authentication applications at the time of booting. | 07-29-2010 |
20100191905 | STORAGE DEVICE, CONTROL METHOD AND CONTROLLER - A storage device comprises a recording/reproducing module which positions a head at an arbitrary position of a storage medium to record or reproduce data and a nonvolatile memory in which a parameter storage area is defined. An adjustment module adjusts various types of parameters necessary for controlling a positioning control module and the recording/reproducing module. A parameter save processing module saves adjusted parameters obtained by the adjustment module in the nonvolatile memory during adjustment, while leaving the minimum number of the adjusted parameters necessary to access a system area of the storage medium at the end of the parameter adjustment, and saves the remaining adjusted parameters in the system area of the storage medium to form a free area in the parameter storage area of the nonvolatile memory. The free area processing module uses the free area of the nonvolatile memory as a storage area for firmware, a log or the like other than the parameters. | 07-29-2010 |
20100188946 | HEAD TESTING METHOD AND HEAD TESTING DEVICE - According to one embodiment, a head testing method, includes: positioning a protrusion against a flexure at a backside of a head slider fixed onto the flexure so that the protrusion receives the head slider from behind the head slider; positioning the head slider on a surface of a rotating magnetic disk so that the head slider faces a surface of the rotating magnetic disk, and reading magnetic information from the magnetic disk by an electromagnetic conversion element of the head slider; and outputting the magnetic information read by the electromagnetic conversion element through the wiring pattern. | 07-29-2010 |
20100188781 | MAGENTIC CIRCUIT FOR VCM AND STORAGE DEVICE - According to one embodiment, a storage device includes at least one disk rotated by a spindle motor on a base formed of a magnetic material, a head actuator configured to access the disk, and a VCM configured to drive the actuator. A magnetic circuit of the VCM includes a top yoke with a flat plate-shape, a top magnet attached to a surface of the top yoke on the base side, and support portions formed on the base, and configured to support the top yoke, the top yoke being magnetically coupled to the support portions. | 07-29-2010 |
20100188780 | ASSEMBLY AND RECORDING MEDIUM DRIVE - According to one embodiment, an assembly includes a first member configured to have a first linear expansion coefficient, a second member configured to have a second linear expansion coefficient smaller than the first linear expansion coefficient, a pair of connecting members configured to connect the first member with the second member, and a notch configured to be formed in the second member between the connecting members and configured to reduce a sectional area of the second member on a section perpendicular to a straight line that connects the connecting members. | 07-29-2010 |
20100188767 | DISK DRIVE AND WRITE CONTROL METHOD THEREIN - According to one embodiment, a disk drive includes a medium scanner and a threshold manager. The medium scanner measures the write count of each head with respect to a disk. The medium scanner executes a read verify process by which data is read out from the disk, during idle state, when the write count is equal to or larger than a predetermined threshold value. The medium scanner rewrites the recovered data to the disk, if a read error occurs and the error is recoverable. The threshold manager initially sets the write count threshold value of each head in accordance with the head performance, and dynamically changes the write count threshold value in accordance with the error rate when the device is in operation. | 07-29-2010 |
20100185846 | COMPUTER PRODUCT, STORAGE DEVICE, AND FIRMWARE MANAGEMENT METHOD - According to one embodiment, an electronic apparatus includes a plurality of storage modules, a rewrite module, a start module, and a switch module. The storage modules store a plurality of firmware items, respectively. The rewrite module rewrites at least one of the firmware items other than a firmware item being executed with a new firmware item. The start module starts the electronic apparatus with one of the firmware items. The switch module switches, when abnormality is detected in the firmware item for starting the electronic apparatus, the firmware item to another firmware item to start the electronic apparatus. | 07-22-2010 |
20100182719 | LUBRICANT AGENT AND MAGNETIC STORAGE DEVICE - According to one embodiment, a lubricant agent comprises a fluorine polymer represented as follows: | 07-22-2010 |
20100177432 | INFORMATION STORAGE APPARATUS, METHOD FOR CORRECTING FEED PITCH OF READ/WRITE HEAD, AND METHOD FOR FORMING SERVO PATTERN - According to one embodiment, an information storage apparatus comprises a storage medium with a first servo pattern having absolute position information and a second servo pattern having relative position information, a pitch correction module configured to move a head with an initial feed pitch by using the second servo pattern by a target distance determined from the first servo pattern, and to correct the initial feed pitch based on a moving distance of the head and a target distance, a head position controller configured to position the head based on the initial feed pitch corrected by the pitch correction module and information of the first and the second servo patterns, and a recording signal generator configured to generate a control signal for making the head record the third servo pattern having the absolute position information. | 07-15-2010 |
20100177431 | INFORMATION STORAGE APPARATUS, ADJUSTMENT APPARATUS THEREOF, AND METHOD FOR FORMING SERVO PATTERN - According to one embodiment, an information storage apparatus comprises a storage medium on which a first servo pattern having absolute position information and a second servo pattern having relative position information are recorded, a head configured to record and reproduce information on and from the storage medium, a recording signal generator configured to generate a control signal for making the head record a third servo pattern having absolute position information on the storage medium while positioning the head by using the first and the second servo patterns, and a data storage unit configured to store recording data for recording the third servo pattern on the storage medium. | 07-15-2010 |
20100175965 | PALLET MONITORING SYSTEM AND MONITORING METHOD - According to one embodiment, a pallet monitoring system for monitoring pallets sequentially conveyed to stations provided along a conveyor path, the system includes: a monitor, connected to the stations. The monitor includes: a defect information collector configured to collect defect information on a defect occurring in the stations; an information storage module configured to store therein the defect information and identification information of the pallets; and a pallet identifier configured to identify the pallets causing a defective product based on the defect information and the identification information stored in the information storage module. | 07-15-2010 |
20100169702 | MEMORY CONTROL APPARATUS, MEMORY OPTIMIZATION PROGRAM PRODUCT, AND MEMORY OPTIMIZATION METHOD - According to one embodiment, a memory control apparatus includes a generator configured to delay a clock signal having a rise and a fall that appear in a constant cycle and to generate a plurality of delay clock signals having delay times different from each other; an extractor configured to extract, from a data signal including reference data, data of a portion corresponding to the rise or fall of each delay clock signal generated; a first determiner configured to determine whether each data extracted coincides with the reference data; and a second determiner configured to determine, from the delay times of the delay clock signals corresponding to the data that have been determined to coincide, a range of the delay time with respect to the rise of the clock signal and a range of the delay time with respect to the fall of the clock signal. | 07-01-2010 |
20100165505 | POWER SUPPLY VOLTAGE ADJUSTMENT CIRCUIT AND INFORMATION STORAGE DEVICE - According to one embodiment, a power supply voltage adjustment circuit includes a determination module and a voltage controller. The determination module determines whether a head is positioned on a data area specified by a command received from a host based on the relationship between the position of the head and the command. The head reads data from or writes data to an information recording medium. When the head is determined not to be positioned on the data area specified by the command, the voltage controller adjusts a target control value of a power supply voltage supplied to a read channel that exchanges information with the head according to a timing from a time point when a servo mark on the information recording medium is detected. | 07-01-2010 |
20100165497 | STORAGE APPARATUS, CONTROL APPARATUS, AND CONTROL METHOD - According to one embodiment, a storage apparatus includes: a reader configured to read a sector recorded in a storage medium; a detector configured to detect a sync mark in the sector; a determiner configured to determine the position of the data region of the sector based on the sync mark detected by the detector; a data generator configured to generate data of the data region based on the data region, the position of the data region being determined by the determiner; a first judging module configured to judge whether the data generated by the data generator is normal; and a data compartment recorder configured to record a data compartment in the storage medium distinguishably from other data compartments, the recorded data compartment comprising a data region from which, among the data generated by the data generator, data judged as abnormal is generated. | 07-01-2010 |
20100164554 | FILTER CIRCUIT, CONTINUOUS TIME FILTER, AND SIGNAL REPRODUCING APPARATUS - According to one embodiment, a filter circuit includes: a first circuit to convert an input voltage into a current using a transfer conductance as a conversion coefficient; a capacitor connected to an output terminal of the first circuit; a second circuit connected to the first circuit and capacitor, and configured to convert an input voltage into a current using a transfer conductance as a conversion coefficient; a setting circuit to adjust the transfer conductance of the first circuit from a first signal and a second signal for gain adjustment and generate a third signal for gain adjustment. The output terminal of the first circuit is connected to an output terminal of the second circuit from which a signal inverted with respect to a signal output from the first circuit is output, the first signal is input to the second circuit, and a frequency band is adjusted by the first signal. | 07-01-2010 |
20100161887 | STORAGE DEVICE, CONTROL METHOD THEREOF, AND ELECTRONIC DEVICE USING STORAGE DEVICE - According to one embodiment, a storage device includes a physical address specifying module, a logical address group specifying module, a data writer, and a storage controller. The physical address specifying module specifies a physical address of write destination of data received together with a logical address among physical addresses each representing a block group including a block of each of flash memories connected in parallel the storage area of which is divided into a plurality of blocks for each sector. The logical address group specifying module specifies a logical address group including logical addresses based on the logical address. The data writer writes data of the logical addresses to blocks in the physical address. The storage controller stores the physical address where the data is written and the logical address group from which the data is written in an address conversion map in association with each other. | 06-24-2010 |
20100157480 | HEAD SLIDER AND STORAGE DEVICE - According to one embodiment, a head slider includes a center pad, a pair of center rails, and a center rail connection wall. The center pad is located in the center on the air outflow end side. The center rails extend toward the air inflow end side continuously from the center pad. The center rail connection wall connects the ends of the center rails on the air inflow end side to surround a space between the center pad and the center rails, and has a height between the top surface and the bottom surface of a floating surface. | 06-24-2010 |
20100157479 | SLIDER, STORAGE DEVICE HAVING THE SLIDER, AND METHOD OF MANUFACTURING SUSPENSION ASSEMBLY HAVING THE SLIDER, AND STORAGE DEVICE - According to one embodiment, a slider of a head includes is configured to fly from a surface of a disk. The slider includes a floating surface configured to oppose the surface of the disk, a positive pressure section in the floating, configured to produce floating force in conjunction with airflow formed by a rotation of the disk, and a first identifying section having a height identical to that of the positive pressure section in the floating surface and configured to identify a gravity center position of positive pressure force generated by the positive pressure section in the floating surface. | 06-24-2010 |
20100157466 | MAGNETIC DISK DEVICE, CONTROL DEVICE AND CONTROL METHOD - According to one embodiment, a magnetic disk device, includes: a magnetic disk; a magnetic head; a writing module configured to write data to a predetermined first track in at least one of the areas by the magnetic head; a reading module configured to read, by using the magnetic head, data of a second track in the at least one of the areas; a first judging module configured to judge whether there is an error in the data read by the reading module; and a first recording module configured to associate and record in a storage module, when the first judging module judges that there is the error in the data of the second track, the at least one of the areas and the number of writing the data to the first track by the writing module. | 06-24-2010 |
20100157461 | SIGNAL REPRODUCING CIRCUIT, MAGNETIC STORAGE DEVICE, AND SIGNAL REPRODUCING METHOD - According to one embodiment, a signal reproducing circuit reproduces a signal read from a recording medium on which the signal has been recorded by perpendicular magnetic recording. The signal reproducing circuit includes a waveform equalizer that equalizes the waveform of the signal based on a waveform equalization target, where D is a one-bit delay operator, previously stored in a storage module. The waveform equalization target is any one of a[1+3D+2D | 06-24-2010 |
20100157456 | DISK DRIVE AND METHOD OF MEASURING FRICTIONAL CHARACTERISTICS - According to one embodiment, in a disk drive, a voice coil motor is controlled to cause a head to minutely vibrate in a radial direction on a track of a disk. When the voice coil motor vibrates the head in the radial direction of the disk, frictional force occurring between the disk and the head is calculated based on the driving force of the voice coil motor generated to vibrate and detected positional information, thereby measuring frictional characteristics. | 06-24-2010 |
20100157455 | TEST DEVICE FOR MAGNETIC STORAGE DEVICE, MAGNETIC STORAGE DEVICE, AND METHOD OF MANUFACTURING MAGNETIC STORAGE DEVICE - According to one embodiment, a test device for a storage device includes: a module configured to acquire from the storage device a value corresponding to a signal level read from a magnetic disk through a magnetic head of the storage device, at a first timing at which an initial power of 0 or greater is supplied to a heater in the head and at a second timing at which a power to the heater is returned to the initial power after the power to the heater has been increased from the initial power, a periphery of a head element in the head has been expanded by the heater, and the element has been protruded toward a magnetic disk side; and a determiner configured to determine whether plastic deformation has occurred in the periphery of the element based on a difference between the values obtained at the first and second timings. | 06-24-2010 |
20100153669 | STORAGE DEVICE AND STORAGE DEVICE CONTROL METHOD - According to one embodiment, a storage device includes a storage medium and a controller. The storage medium includes a plurality of normal sectors that stores data and a redundant sector that stores redundant sector data for restoring data stored in each of the normal sectors. The controller stores invalid information in a normal sector when data is to be written to the normal sector belonging to a data section formed of a combination of the normal sectors and the redundant sector corresponding to the normal sectors. The invalid information indicates that the redundant sector data stored in the redundant sector belonging to the data section is invalid. | 06-17-2010 |
20100153664 | CONTROLLER AND STORAGE DEVICE FOR CHANGING SEQUENTIAL ORDER OF EXECUTING COMMANDS - According to one embodiment, a controller includes: a memory configured to hold commands pre-assigned with a sequential order of execution and to hold for each of the commands a waiting time indicating an elapsed time period from a time point at which the command started being held; a selector configured to select from the commands N commands having the longest waiting times, where N is an integer equal to or greater than one; a classifier configured to classify the commands into N+1 groups so that each of the N commands selected by the selector belongs to a different group; and a changer configured to assign priorities to the N+1 groups based on the waiting times of the N commands selected by the selector, and to change the sequential order of execution for the commands so that commands belonging to a group having a high priority are executed first. | 06-17-2010 |
20100149694 | DISK DEVICE - According to an embodiment, a disk device includes a latch mechanism configured to retract a head on a distal end portion of an actuator to a ramp mechanism and latch a ferromagnetic member disposed on the actuator on the side of a motor coil by a latch magnet, a shaft protruding from that part of a base of the disk device which is located near the latch mechanism, and a rotary lever pivotably mounted on the shaft. The rotary lever includes a first arm on the disk side being extended over the disk so that the rotary lever is rotated by a pressure of airflow produced as the disk rotates, and a second arm on the latch magnet side configured to move as the rotary lever is rotated by the airflow pressure, to weaken magnetic coupling between the latch magnet and the ferromagnetic member. | 06-17-2010 |
20100149692 | HEAD SLIDER AND STORAGE DEVICE - According to one embodiment, a head slider includes a slider main body, a front rail, and at least a pair of grooves. The slider main body defines a base surface. The front rail rises from the base surface on the air inflow side of the slider main body and defines an air bearing surface on the top surface. The grooves are each formed in the front rail and define the air outflow end closer to the air inflow side than the air outflow end of the air bearing surface. The grooves are spaced apart in the slider width direction of the slider main body. | 06-17-2010 |
20100149690 | MAGNETIC HEAD, METHOD OF MANUFACTURING MAGNETIC HEAD, ACTUATOR, AND MAGNETIC DISK DEVICE - According to one embodiment, a magnetic head includes a write element, a first insulating member, and a second insulating member. The first insulating member is made of an insulating material with high rigidity. The first insulating member is formed around the write element as a surface layer of the floating surface. The second insulating member is made of an insulating material with lower rigidity than the first insulating member. The second insulating member is formed near the first insulating member around the write element beneath the surface layer of the floating surface. The first insulating member is polished on the floating surface. A portion of the floating surface where the second insulating member is arranged protrudes more than a portion of the floating surface around the write element. | 06-17-2010 |
20100149683 | MAGNETIC DISK DRIVE AND WRITE OFFSET CORRECTION METHOD THEREIN - According to one embodiment, a magnetic disk drive uses a patterned medium on which data tracks having a recording layer and grooves having no recording layer as a disk. The magnetic disk drive includes a correction unit which corrects the head center position of a write head so that a head edge portion on the side to which the top edge of the write head is tilted falls within or substantially falls within a groove on the side to which the top edge of the write head is tilted. | 06-17-2010 |
20100149681 | RECORDING METHOD AND STORAGE DEVICE - According to one embodiment, a recording method includes: skipping a track by a skip amount in a skip region smaller than an overall recording region on a magnetic recording medium by using an extra region that is unnecessary for securing a storage capacity to be provided by a storage device, the extra region being on the recording surface of the magnetic recording medium; and recording data while skipping the track in the skip region, wherein the skip region is set to a region in which a track to be recorded on the magnetic recording medium is expected to influence an adjacent track in accordance with at least one of a condition and a state of the storage device. | 06-17-2010 |
20100149674 | METHOD OF MANUFACTURING DISK DEVICE, METHOD OF WRITING SERVO INFORMATION TO STORAGE DISK, AND DISK DEVICE - According to one embodiment, a method of writing servo information comprises: moving a head at a predetermined pitch in the radial direction of a storage disk to write servo information to each radial direction position in the circumferential direction of the storage disk; detecting a positional deviation value of the head while the servo information is being written to the radial direction position and determining whether the positional deviation value exceeds a predetermined value; and writing, when the positional deviation value exceeds the predetermined value, the position of defective servo information where the positional deviation value exceeds the predetermined value to a predetermined position in the radial direction of the storage disk. | 06-17-2010 |
20100142094 | MAGNETIC HEAD SLIDER AND MAGNETIC DISK DEVICE - According to one embodiment, a magnetic head slider includes: a magnetic head; a slider main body configured to be provided with the magnetic head; a first protrusion portion configured to be provided on the slider main body so as to abut the magnetic head; a second protrusion portion configured to be provided on a top surface of the first protrusion portion; and a cutout portion configured to be provided to an edge portion on the top surface of the second protrusion portion, the edge portion being on a side of the top surface. | 06-10-2010 |
20100142093 | STORAGE DEVICE AND METHOD OF CALCULATING TRANSFER AMOUNT OF LUBRICANT - According to one embodiment, a storage device includes a storage medium and a head slider. The storage medium includes a surface coated with a lubricant. The head slider includes a medium facing surface that faces a surface of the storage medium based on the relative movement to the storage medium. The product ph [atm·nm] of air pressure p [atm] defined between the surface of the storage medium and the medium facing surface and a floating amount h [nm] of the medium facing surface defined from the surface of the storage medium satisfies | 06-10-2010 |
20100142083 | MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE - According to one embodiment, a magnetic recording medium includes a substrate and a single domain magnetic dot. The single domain magnetic dot is provided on the substrate and is written with a compensation signal for controlling the position of at least one of a recording device and a reproducing device. The single domain magnetic dot has a length in the radial direction of the substrate shorter than a length in the circumferential direction of the substrate. | 06-10-2010 |
20100142081 | MAGNETIC DISK DEVICE, ACTUATOR ARM, AND SUSPENSION - According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, and an actuator. The magnetic disk stores data. The magnetic head floats due to an air flow produced by the rotation of the magnetic disk to write and read data to and from the magnetic disk. The actuator includes a suspension and an actuator arm. The suspension supports the magnetic head. The actuator arm supports the suspension. The actuator is provided with a strip projection, a bump, a plurality of projections, or a concave portion on the upstream side of an air flow produced by the rotation of the magnetic disk. | 06-10-2010 |
20100139084 | HEAD ASSEMBLY MANUFACTURING APPARATUS AND HEAD ASSEMBLY MANUFACTURING METHOD - According to one embodiment, a head assembly manufacturing apparatus for manufacturing a head assembly including a load beam having a protrusion and a gimbal in contact with the load beam at the protrusion, includes: a heater configured to heat the protrusion from a back surface of the load beam; a thermal image forming module configured to form a first image which is a temperature distribution image of the gimbal by detecting infrared radiation emitted from a front surface of the gimbal; and a position detector configured to detect a position of the protrusion on the gimbal based on the first image formed by the thermal image forming module. | 06-10-2010 |
20100134928 | HEAD SUSPENSION ASSEMBLY AND STORAGE MEDIUM DRIVING APPARATUS - According to one embodiment, a head suspension assembly includes: a head slider; a fixed piece supported on a surface of a platy gimbal; a first arm configured to extend from the fixed piece, be connected to the head slider, and include a platy first flexible portion that extends, between the fixed piece and the head slider, along a first virtual plane perpendicular to the surface of the gimbal; a second arm configured to extend from the fixed piece, be connected to the head slider, and include a platy second flexible portion configured to extend along a second virtual plane that is perpendicular to the surface of the gimbal and that intersects with the first virtual plane at an intersection angle less than 180 degrees; a first piezoelectric element joined to the first flexible portion; and a second piezoelectric element joined to the second flexible portion. | 06-03-2010 |
20100134924 | STORAGE DEVICE - According to one embodiment, a storage device includes at least one storage disk fixed to a hub mounted on a motor by a disk fixing mechanism, and a head configured to read and write information from and to the storage disk. The disk fixing mechanism includes a clamp ring, including a mounting hole on an inner peripheral side thereof through which the clamp ring is attached to the hub by a screw and a pressing portion for pressing the disk and a balance adjustment recess on an outer peripheral side thereof, and a balance wire attached to the balance adjustment recess. A first portion from the inner peripheral side to the pressing portion of the clamp ring and a second portion with the balance adjustment recess are formed of different materials. | 06-03-2010 |
20100134916 | MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE DEVICE - According to one embodiment, a magnetic recording medium includes a disc substrate, a first recording layer, and a second recording layer. The first recording layer is disposed in at least one of a plurality of data storage areas partitioned in a radial direction on the disc substrate. A magnetic material is deposited on the first recording layer. The second recording layer is disposed in the data storage areas except the data storage area where the first recording layer is disposed. The second recording layer includes a magnetic material and a non-magnetic material that are alternately arranged in the in-plane direction of the upper surface of the disc substrate. | 06-03-2010 |
20100128384 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING APPARATUS - According to one embodiment, a magnetic recording medium to which a signal is recorded by reversing magnetization of a magnetic body, includes: a servo region to which a servo signal is written; a data region configured to include a magnetic region of a track to which data is written, the magnetic region being separated from other magnetic region of other track; and a periodic magnetic pattern region configured to be provided at a head portion of the data region following the servo region, and is inclined at a predetermined angle with respect to a circumferential direction of the magnetic recording medium, over a predetermined length in a radius direction of the magnetic recording medium. | 05-27-2010 |
20100106897 | STORAGE DEVICE, DISK DEVICE, WRITE DETERMINING METHOD, AND CONTROL DEVICE - According to one embodiment, a storage device divides and writes into pages a management information table for managing addresses at which data are written. The storage device includes: a writing module configured to write a duplicate of a last page of the management information table after writing the management information table divided into the pages; an acquiring module configured to acquire the last page and the duplicate of the last page written by the writing module; and a determining module configured to determine whether the writing of the management information table has been successful, by comparing the last page and the duplicate of the last page acquired by the acquiring module with each other, or by checking whether the duplicate of the last page has been written by the writing module. | 04-29-2010 |
20100103561 | STORAGE DEVICE, PROCESSOR OR STORAGE DEVICE, AND COMPUTER PROGRAM PRODUCT - According to one embodiment, a storage device includes: ahead actuator configured to move a head to an arbitrary position on a disk medium; a write/read module configured to write data to or read data from the disk medium using the head; an adjustment region selector configured to divide the disk medium into a plurality of regions in a circumferential direction, write test data to each of the regions, read the test data to measure signal quality of the each of the regions, compare the signal quality of the each of the regions, and select a parameter adjustment region; and a parameter adjustment module configured to adjust a parameter used for the write/read module to write data to and read data from the disk medium to an optimal value using the selected parameter adjustment region. | 04-29-2010 |
20100097728 | HEAD SUSPENSION ASSEMBLY AND STORAGE MEDIUM DRIVE APPARATUS - According to one embodiment, a head suspension assembly includes: a head slider; a fixed piece configured to be fixed to the head slider; a flexible long piece configured to extend from the fixed piece and to be connected to a head suspension; an arm piece configured to be connected to the head suspension at one end and slidably contact a surface of the head slider at other end; and a piezo element configured to be attached to the arm piece. | 04-22-2010 |
20100097725 | CARRIAGE ASSEMBLY AND STORAGE MEDIUM DRIVING DEVICE - According to one embodiment, a carriage assembly includes a carriage block body, a carriage arm, a coil, a pair of support arms, and a frame body. The carriage block body is rotatably connected to a spindle. The carriage arm extends forward from the front of the carriage block body. The coil is located behind the carriage block body, and defines a linear region extending along a reference straight line extending radially from the center of the spindle. The support arms extend in parallel to the linear region from a back surface of the carriage block body. The frame body is made of a resin material, and fills between the coil and the support arms to couple the coil and the support arms. The support arms extend more outside than the external end of the linear region of the coil in the radial direction. | 04-22-2010 |
20100095515 | METHOD AND APPARATUS FOR ASSEMBLING A CARRIAGE ASSEMBLY - A method of assembling a carriage assembly that is operable, during a crimping step that passes a ball, which has a diameter that is equal to or larger than an inner diameter of spacer holes of suspensions, successively through the spacer holes using a bar-shaped pressing member that is subjected to ultrasonic vibration to thereby crimp spacer hole inner circumferential portions of the spacer portions and attach the suspensions to the front end portions of the carriage arms, to prevent the pressing member that presses the ball from colliding with an inner circumferential surface and the like of the spacer holes of the spacer portions and is therefore able to substantially eliminate tilting from the standard angle of the suspensions due to deformation of the spacer portions, and an assembling apparatus that uses such method are provided. | 04-22-2010 |
20100091401 | HEAD SLIDER AND STORAGE MEDIUM DRIVING DEVICE - According to one embodiment, a head slider, includes: a slider body; an insulating nonmagnetic film configured to be laminated on an air outflow side end face of the slider body; a magnetoresistive effect film configured to be buried in the nonmagnetic film; first and second wiring patterns configured to be buried in the nonmagnetic film and connected to the magnetoresistive effect film; a third wiring pattern configured to be buried in the nonmagnetic film and connected to the first and second wiring pattern in parallel to the magnetoresistive effect film; and a switch element configured to be buried in the nonmagnetic film and change conductivity of the third wiring pattern between conduction and non-conduction. | 04-15-2010 |
20100088466 | STORAGE DEVICE, STORAGE CONTROL DEVICE, AND CONTROL METHOD - According to one embodiment, a storage device includes an actuator to move a head to a position on a disk medium; a module to record or reproduce data to or from the disk medium using the head; a memory controller to write or read to or from a non-volatile memory; a buffer controller to write or read to or from a buffer memory; an interface controller to transmit and receive to or from an upper device; a switching module to switch data transfer paths among the module, the memory controller, and the interface controller; and an access controller to control the switching module to transfer data read from the non-volatile memory to the upper device concurrently with transferring and storing the read data in a cache region of the buffer memory, upon receiving from the upper device a command to read the data from the non-volatile memory. | 04-08-2010 |
20100073797 | STORAGE DEVICE AND METHOD OF CONTROLLING STORAGE DEVICE - According to one embodiment, a storage device includes a target track write module and a test pattern read module. The target track write module performs a write operation on a target track, which is a predetermined track intersecting a test pattern, on a storage medium to which the test pattern is written. The test pattern intersects a plurality of tracks arranged at regular intervals and is continuously arranged over the tracks. The test pattern read module reads the test pattern overwritten by the target track write module. | 03-25-2010 |