| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 360040000 | In specific code or form | 31 |
| 20090116133 | LOGIC OPERATIONS ON A HARD DISK DRIVE - A method of how to perform logic operations on a hard disk drive with magnetic media capable of superimposing the binary information is invented. Such media contain magnetic particles with different anisotropy fields and different anisotropy axes orientations. Three magnetization states are utilized. The binary information is encoded as 0−> 00 and 1−> 11. In the beginning, strong magnetic fields created by the writing head record the first binary number on a track as the sequence of transitions between different magnetization states. All previous information is erased. Then, moderate magnetic fields are applied to the same track and reverse a part of magnetic particles writing the second binary number. As the result, we obtain superimposed transitions between different magnetization states. The reading sensor detects the magnetization transitions and gives the result of logic operations. | 05-07-2009 |
| 20100079890 | METHOD AND APPARATUS FOR ENCODING POSITIONING INFORMATION ON A MAGNETIC TAPE MEDIA - Method and apparatus for magnetic tape recording where the magnetic tape has data and servo tracks, and address or other positioning information is encoded on the servo track. A servo track burst pattern is provided whereby certain of the bursts define a gap between the stripes of the first and second half of the burst, each burst including a certain number of the stripes. The presence of the gap in a burst indicates a first binary state, which may be defined as a digital one, and the absence of the gap defines the second binary state, which may be defined as digital value 0. Hence by defining a set of 1s and 0s, longitudinal positioning or address information is encoded on the servo track, thereby improving servo track following of a tape drive. | 04-01-2010 |
| 20100172048 | Servo patterns for patterned media - Servo patterns for patterned media. The servo pattern includes specification of cylinder/track ID with and without a Gray code. The servo pattern space is minimized by the optimum usage of the islands. This is achieved by island allocation rules to take advantage of non-magnetic island. The island allocation also provides for easier lift-off. Logic is used to encode and decode the Gray code. Further, the Gray code is designed to stabilize the magnetic island/non-magnetic island ratio to allow for easier manufacture. | 07-08-2010 |
| 20100177421 | STORING PARTIAL DATA SETS TO MAGNETIC TAPE - Methods, logic, apparatus and computer program product write data, comprising less than a full Data Set, to magnetic tape. Data is received from a host, a do-not-interleave command is issued and C1 and C2 ECC are computed. Codeword Quad (CQ) sets are then formed. At least one CQ set of the Data Set is written to a magnetic tape in a non-interleaved manner and a Data Set Information Table (DSIT) is written to the magnetic tape immediately following the at least one written CQ set. An address transformation may be used to cancel interleaving. Writing a CQ set may include writing a plurality of contiguous instances of the CQ set to the magnetic tape to maintain the effectiveness of ECC capability. | 07-15-2010 |
| 20100177422 | REWRITE-EFFICIENT ECC/INTERLEAVING FOR MULTI-TRACK RECORDING ON MAGNETIC TAPE - For writing data to multi-track tape, a received data set is received and segmented into unencoded subdata sets, each comprising an array having K | 07-15-2010 |
| 20100220408 | DISK DRIVE WITH MULTI-PROTOCOL CHANNEL TO CONTROLLER INTERFACE AND METHOD - An apparatus includes a disk arrangement, a first signal processing path configured to output data from the disk arrangement according to a first protocol, a second signal processing path configured to output data from the disk arrangement according to a second protocol, and an interface including a set of electrical conductors and a mode control unit. The mode control unit is configured to output data from the first signal processing path on the set of electrical conductors according to the first protocol and to output data from the second signal processing path on the set of electrical conductors according to the second protocol according to a control signal received by the mode control unit. The second protocol is different from the first protocol. | 09-02-2010 |
| 20100277823 | MAGNETIC DISC CONTROLLER AND METHOD - A magnetic disk controller includes a first buffer that includes a first storage area that stores former portions of pieces of writing data, and a second storage area that stores latter portions of pieces of writing data; an encoding unit that encodes a former portion of the first piece of writing data; a second buffer that stores the encoded former portion of the first piece of writing data; and a buffer control unit that writes the encoded former portion of the first piece of writing data into a first sector of the magnetic disk. The encoding unit encodes the latter portion of the first piece of writing data. The second buffer stores the encoded latter portion of the first piece of writing data. The buffer control unit, writes the encoded latter portion of the first piece of writing data into the first sector of the magnetic disk. | 11-04-2010 |
| 20110013306 | Apparatus, signal-processing circuit and device for magnetic recording system - To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus. | 01-20-2011 |
| 20110085259 | METHOD FOR SETTING ZONE FORMAT OF A DISK FOR STORING DATA AND DISK DRIVE - A method for dividing a data area on a disk into a plurality of concentric zones and determining a format for each zone so that data tracks in the zone have the same number of data sectors. The method includes dividing a data area into a plurality of zones with provisional boundaries. The method also includes determining a linear recording density for a selected zone. The method further includes selecting the number of data sectors per data track corresponding to the determined linear recording density from specified values. Moreover, the method includes resetting a boundary of the zone at a new boundary shifted from the provisional boundary according to a selected value. | 04-14-2011 |
| 20110134560 | WRITING AND READING MULTI-LEVEL PATTERNED MAGNETIC RECORDING MEDIA - A method and system for reading readback waveforms representing written magnetization states of a pair of magnetic islands of a two-level patterned magnetic recording medium, and a structure that include a multi-level patterned magnetic medium. Reading the readback waveform representing the written magnetization state includes: identifying the written magnetization state by decoding the readback waveform; and displaying and/or recording the written magnetization state. The magnetic medium of the structure includes distributed pillars. Each pillar includes a first and second magnetic island. Each magnetic island has a magnetic easy axis oriented at a first tilt angle (α | 06-09-2011 |
| 20110205656 | Servo Pattern Architecture and Method Using Same to Improve LPOS Encoding Efficiency - A sequential data storage medium, such as for example and without limitation a magnetic tape, comprising a sequence of plurality of servo patterns encoded therein, which provide lateral position information and LPOS information. Each servo pattern comprises a first burst comprising a first pulse, a second pulse, a third pulse, a fourth pulse and a fifth pulse and a second burst comprising a sixth pulse, a seventh pulse, an eighth pulse, a ninth pulse and a tenth pulse. The widths of the plurality of pulses, in combination with the spacings between the plurality of pulses, encode two bits of data. | 08-25-2011 |
| 20120162805 | DISK STORAGE DEVICE, CONTROLLER OF THE SAME, CONTROLLING METHOD PERFORMED BY THE SAME, AND ELECTRONIC DEVICE - According to one embodiment, a disk storage device includes: a disk on which a servo pattern is recorded; a head; a driver; a signal generator; a demodulator; and a controller. Position signals for detecting an offset position from a center of a track are recorded in a recording area of a servo pattern. The signal generator generates a first timing signal indicating a timing for reading the position signals. When the controller performs a seek operation for moving the head to a target track, the signal generator generates a second timing signal. The period of the second timing signal for reading each of the position signals is made shorter than that of the first timing signal. A center time of the period of the second timing signal is shifted closer to a demodulation center time corresponding to a center of the recording area than that of the first timing signal. | 06-28-2012 |
| 20130027801 | INTER-TRACK INTERFERENCE CANCELATION IN THE PRESENCE OF FREQUENCY OFFSET - An initial phase offset between a center track and a side track is determined. An initial side track pulse shape is determined using the initial phase offset and side track interference. The initial side track pulse shape minimizes a contribution of the side track interference to a center track bit. The contribution of the side track interference is removed from the center track bit using the initial side track pulse shape and the side track interference. | 01-31-2013 |
| 20130107393 | LONGITUDINAL POSITION INFORMATION ON A MAGNETIC TAPE MEDIA | 05-02-2013 |
| 20130128374 | FIXING TAP COEFFICIENTS IN A PROGRAMMABLE FINITE-IMPULSE-RESPONSE EQUALIZER - A method for selecting which tap coefficients of a programmable finite-impulse-response (FIR) equalizer to fix is disclosed. In one embodiment, such a method includes performing an initial calibration to determine an initial value for each tap coefficient of a FIR equalizer. These initial values may be used to produce a first waveform. The method then performs an operation on the first waveform to produce a second waveform comprising multiple lobes. The second waveform is then analyzed to determine one or more lobes of the second waveform that have the largest area. The method then fixes coefficients of one or more taps that are closest to the lobe or lobes having the largest area. A corresponding apparatus and computer program product are also disclosed. | 05-23-2013 |
| 20130235485 | STORAGE DEVICE HAVING WRITE SIGNAL WITH MULTIPLE-SLOPE DATA TRANSITION - A hard disk drive or other disk-based storage device comprises a storage disk, a read/write head configured to read data from and write data to the disk, and control circuitry coupled to or otherwise associated with the read/write head. The control circuitry comprises a write driver configured to generate a write signal for data to be written to the storage disk, and a multiple-slope transition controller associated with the write driver and configured to control a data transition in the write signal such that the data transition comprises at least two different segments each having a different slope, with the transition controller comprising separate slope control mechanisms for each of the segments. By way of example, the data transition may comprise a dual-slope transition having first and second segments arranged sequentially between a start point and an end point of the data transition. | 09-12-2013 |
| 20140002918 | SYSTEMS AND METHODS FOR READING AND DECODING ENCODED DATA FROM A STORAGE DEVICE | 01-02-2014 |
| 20140211336 | AUTOMATIC GAIN CONTROL LOOP ADAPTATION FOR ENHANCED NYQUIST DATA PATTERN DETECTION - Techniques are provided for automatic gain control loop adaptation in circuitry for processing such data signals. In one example, an apparatus comprises read channel circuitry and signal processing circuitry associated with the read channel circuitry. The signal processing circuitry comprises an amplifier, a detector operatively coupled to the amplifier, and a feedback path operatively coupled between the detector and the amplifier. The amplifier is configured to receive and amplify an input signal received by the read channel circuitry. The detector is configured to detect a data pattern from the amplified input signal. The feedback path is configured to provide a feedback signal to the amplifier to adjust a gain of the amplifier, and to generate the feedback signal in accordance with a value selected to improve detection of the data pattern by increasing an amplitude of the data pattern around a given frequency. | 07-31-2014 |
| 20140285915 | DISK STORAGE APPARATUS, DATA REPRODUCTION APPARATUS AND DATA REPRODUCTION METHOD - According to one embodiment, in a disk storage apparatus, a cancel controller cancels interference on a read target track from adjacent tracks from equalization waveform data obtained by applying waveform equalization processing to a read signal of the read target track based on an interference amount between adjacent tracks. An ITI controller determines whether or not an interference amount for a next read target track exceeds a prescribed value based on the interference amount corresponding to the read target track, and stores, when the interference amount exceeds the prescribed value, the equalization waveform data for the read target track in the memory as cancel data used to cancel interference on the next read target track. | 09-25-2014 |
| 20150015982 | OPTIMUM TAPE LAYOUT SELECTION FOR IMPROVED ERROR CORRECTION CAPABILITY - According to one embodiment, a system for selecting an optimum tape layout to store data on a tape medium may include a processor and logic integrated with and/or executable by the processor, the logic being configured to: select a family of data set layouts based on parameters associated with at least a tape drive and the tape medium, compute a set of all minimum distances for the selected family of data set layouts, calculate a first performance metric associated with each possible set of parameters, select a best first performance metric from all calculated first performance metrics and store a set of parameters associated with the best first performance metric, and select a data set layout algorithm which utilizes the set of parameters associated with the best first performance metric, wherein the data set layout algorithm and a rewrite layout algorithm combine to form an optimum tape layout. | 01-15-2015 |
| 20150062734 | Systems and Methods for Multi-Level Encoding and Decoding - A storage system includes a storage medium operable to maintain a data set, a read/write head assembly operable to write the data set to the storage medium and to read the data set from the storage medium, a multi-level encoder operable to encode the data set at a plurality of different code rates before it is written to the storage medium, and a multi-level decoder operable to decode the data set retrieved from the storage medium and to apply decoded values encoded at a lower code rate when decoding values encoded at a higher code rate. | 03-05-2015 |
| 20150085393 | TAPE HEADER PROTECTION SCHEME FOR USE IN A TAPE STORAGE SUBSYSTEM - In one embodiment, a system for integrating data and header protection includes a processor and logic integrated with and/or executable by the processor, the logic being configured to receive a data array organized in rows and columns, each row of the data array comprising two or more interleaved C1 codewords (CWI), and modify one or more rows of the data array to include a header and error correction code (ECC) parity to form one or more modified rows, wherein each modified row includes two or more interleaved codewords, at least one codeword being a C1′ codeword which includes ECC parity, wherein each header comprises a CWI Designation (CWID) which indicates a location of the CWI within the data array, and wherein none of the CWIDs are split across multiple C1′ codewords in a single modified row. Other systems, methods, and computer program products are presented in additional embodiments. | 03-26-2015 |
| 20150103428 | COLOR STORAGE AND TRANSMISSION SYSTEMS AND METHODS - A system comprises a writer to form a plurality of color mits on a base material, wherein at least one of the color mits may represent computer-readable instructions comprising data other than pixel-image data. The plurality of color mits may include a first color mit and a second color mit, wherein the first color mit represents information data, and the second color mit represents that the first color mit contains a particular type of information data. The system also may include a reader to read colors of the plurality of color mits on the base material. The system may comprise a device to map at least one of the color mits to computer-readable instructios. The system may further comprise a processor configured to transmit signals using a colored light. | 04-16-2015 |
| 20150303947 | Systems and Methods for Protected Portion Data Processing - The present inventions are related to systems and methods for data processing, and more particularly to systems and methods for protecting portions of data sets during data processing. | 10-22-2015 |
| 20150380050 | Multi-Level Enumerative Encoder And Decoder - A storage system includes a storage medium operable to maintain a data set, a read/write head assembly operable to write the data set to the storage medium and to read the data set from the storage medium, a multi-level enumerative encoder operable to encode the data set before it is written to the storage medium as encoded data, wherein the enumerative encoder applies an enumeration using a plurality of level-dependent bases, and a decoder operable to decode the data set after it is read from the storage medium. | 12-31-2015 |
| 360041000 | Nonreturn to zero | 2 |
| 20120075739 | HIGH-RATE TRANSITION CONTROL CODE FOR MAGNETIC RECORDING CHANNELS - A method and apparatus for reducing noise in a communication signal is provided. The method includes converting raw channel data from the communication signal to a sequence of transition code symbols, each symbol having a plurality of bits, each bit having a position within the symbol. The method also includes sending the bits of each symbol to a plurality of bins, each bin corresponding to the position of each bit within the symbol. For each bin having a number of transitions greater than a number of non-transitions, the method also includes flipping every bit in the bin and setting a corresponding bit in a flip control word to a first value. The method still further includes binary adding the flip control word to each transition code symbol. | 03-29-2012 |
| 20150310889 | RUN-LENGTH LIMITED (RLL) CODES - A method of encoding an input data into a codeword that satisfy a k constraint includes partitioning the input data into a plurality of data blocks comprising a first data block and a plurality of remaining data blocks; performing a first analysis of the plurality of data blocks for modifying each of the plurality of remaining data blocks that satisfy a first predetermined criterion; performing a second analysis of the plurality of data blocks after the first analysis for modifying each of the plurality of data blocks that satisfy a second predetermined criterion; and converting each bit of the plurality of data blocks after the second analysis to produce the codeword in Non-Return-to-Zero (NRZ) format with the k constraint. There is also provided a method of decoding the codeword with satisfies the k constraint into an output data, and the corresponding encoder and decoder. | 10-29-2015 |
| 360042000 | Phase code | 1 |
| 20090244757 | Methods and Apparatus for Low Power Hard Disk Drive Servo Writers - Methods and apparatus to for low power hard disk drive servo writers. A disclosed servo writer comprises a distribution circuit to receive one or more pulses from a pulse generator, the distribution circuit having a biasing circuit have one of a first write mode or a second write mode based on an operating condition signal; and a first signal generator to form a first write signal and a second signal generator to form a second write signal, the first and second signal generators being actuated by the distribution circuit, wherein the distribution circuit actuates one of the first and second signal generators in the first write mode and the distribution circuit actuates the first and second signal generators in the second write mode. | 10-01-2009 |
| 360043000 | Multi-frequency | 2 |
| 20080266695 | MAGNETIC SENSOR CONTROL DEVICE - A magnetic sensor control device has an input section, a selection section, a calculation section, and a setting section. The input section inputs a plurality of magnetic data each having 3 components sequentially output from a 3-dimensional (3D) magnetic sensor. The selection section selects 4 magnetic data satisfying a predetermined 4-point selection condition from the plurality of the input magnetic data. The calculation section calculates a center point equally distant from 4 points corresponding to the 4 selected magnetic data. The setting section sets 3 components representing the center point as an offset of the magnetic data. | 10-30-2008 |
| 20150302871 | METHOD AND APPARATUS FOR DETERMINING RELATIVE HEAD-TO-DISK SPEED - A system including a write head, a read head, a mixer, and a filter. The write head is configured to write a pattern on a track of a medium of a hard disk drive, wherein the pattern has a first frequency. The read head is configured to read the pattern written on the track of the medium of the hard disk drive. The mixer is configured to mix a first signal generated by reading the pattern with a second signal to obtain a mixed signal. The second signal has a second frequency, and wherein the second frequency is different than the first frequency. The filter is configured to filter the mixed signal to determine a relative head-to-disk speed. The filter has a parameter selected based on a difference between the first frequency and the second frequency. | 10-22-2015 |
| 360044000 | Intra-cell transition | 1 |
| 20120105993 | READING MULTI-LAYER CONTINUOUS MAGNETIC RECORDING MEDIA - A method and system for reading readback pulse shapes representing a magnetization state transition between such written magnetization states of a two-layer continuous magnetic recording medium. A readback pulse shape representing a written magnetization state transition is read. The written magnetization state transition is uniquely identified from the readback pulse shape of the transition or from both the readback pulse shape of the transition and the readback pulse shape of one or more next magnetization state transitions. | 05-03-2012 |
