Entries |
Document | Title | Date |
20080198716 | METHOD OF RECORDING DATA TO AN INFORMATION RECORDING MEDIUM - A method of recording data optically to an optical disk having a plurality of sectors, in which each sector has a region to be recorded with data, the data is recorded in units of blocks, and the block includes a predetermined number of sectors and is a data unit including error correction codes. In recording data related to a content by dividing and recording the data in a plurality of sectors continuously, dummy data to be used for extracting a clock in phase lock loop (PLL) for data reproduction is recorded on a region adjacent before a sector from which data recording is started. The data related to the contents is recorded on sectors following the region recorded with the dummy data. | 08-21-2008 |
20080205225 | OPTICAL DISC, RECORDING APPARATUS, READING APPARATUS, RECORDING METHOD AND READING METHOD - An optical disc | 08-28-2008 |
20080205226 | METHOD OF AND APPARATUS FOR MANAGING DISC DEFECTS USING TEMPORARY DEFECT MANAGEMENT INFORMATION (TDFL) AND TEMPORARY DEFECT MANAGEMENT INFORMATION (TDDS), AND DISC HAVING THE TDFL AND TDDS - A disc having an updatable defect management area used by an apparatus for managing defects on the disc, the disc including a user data area which includes user data, a spare area that is a substitute area for a defect existing in the user data area, and an area in which are recorded an address of data that is last recorded in the user data area and an address of a replacement data recorded in the spare area. Accordingly, the disc defect management method and apparatus are applicable to a recordable disc such as a write-once disc while effectively using a defect management area of the disc. | 08-28-2008 |
20080205227 | METHOD AND APPARATUS FOR MANAGING DEFECTS IN RECORDING MEDIA, A COMPUTER READABLE MEDIUM INCLUDING COMPUTER READABLE CODE FOR THE SAME, AND A DEFECT MANAGED RECORDING MEDIUM OBTAINED USING THE SAME METHOD, APPARATUS, AND COMPUTER READABLE MEDIUM - A method, apparatus and computer readable medium for managing recording medium defects and a defect managed recording medium. The recording medium includes a spare area in which a replacement area, which is a substitute for a defective area of the recording medium, is formed, and a temporary defect management area in which temporary management information that specifies the defective area and the corresponding replacement area is recorded, wherein position information and state information regarding the defective area are recorded in the replacement area. Accordingly, it is possible to restore defect information even if recording medium defect management on the recording medium ended abnormally. | 08-28-2008 |
20080212431 | Drive Device - A drive apparatus of the present invention includes a recording/reproduction section and a drive control section. The drive control section performs a process including: determining a first track of the plurality of tracks, based on the physical address corresponding to the logical address included in the recording instruction and the track management information; determining whether or not the first track is a closed track; when the first track is determined to be the closed track, performing a process including: determining a second track different from the first track, the second track being an open track; determining as a next writable address a physical address indicating a location at which data can be recorded next in the second track, based on the last recorded address in the second track; pseudo-overwrite recording the data at the next writable address as a replacement location. | 09-04-2008 |
20080212432 | Aberration Correcting Apparatus, Optical Pickup, and Aberration Correcting Method - An optical pickup to be used for both DVD and CD is provided with an aberration correcting device using liquid crystal on an input side of an objective lens. A spherical aberration of a CD is corrected by using an electrode for DVD spherical aberration correction and electrodes for DVD astigmatism correction. | 09-04-2008 |
20080212433 | Optimum Tracking Error Compensation For Improved Optical Disk Playability - The present invention relates to a method for operating an optical drive system capable of reproducing/recording information from/to an optical carrier ( | 09-04-2008 |
20080212434 | Recording medium having data structure for managing at least a data area of the recording medium and recording and reproducing methods and apparatuses - The data structure on the recording medium includes a temporary defect management area storing a data block. The data block includes sequential recording information and a temporary definition structure. The sequential recording information provides information on continuous recording areas in the data area of the recording medium. The temporary definition structure includes at least one pointer to information in the temporary defect management area. | 09-04-2008 |
20080212435 | METHOD OF AND APPARATUS FOR MANAGING DISC DEFECTS IN DISC, AND DISC ON WHICH DEFECTS ARE MANAGED - A method of and apparatus for managing disc defects in a disc using a temporary defect management area in the disc, and the disc, where the method includes recording in a data area user data; and recording in a temporary defect management area, which is present in at least one of a lead-in area and a lead-out area, which temporary defect information and temporary defect management information regarding the user data recorded in the data area are recorded. Accordingly, the method and apparatus are applicable to recordable discs and capable of effectively using the defect management area. | 09-04-2008 |
20080219119 | Optical pickup and optical disc unit - Provided is an optical pickup which can eliminate a problem of causing a focus error signal and a tracking error signal to fluctuate due to interference of a signal light beam with a return light beam from another recording surface of a multi-layer optical disc during reproduction, | 09-11-2008 |
20080219120 | Method and System to Improve Playability of Optical Record Medium - In summary, when an optical record medium is to be played, the optical drive first determines which type of optical record medium is inserted based on detection of a few signals and execution of a few calibrations. These calibrations could fail sometimes, making the optical record medium completely unrecognisable or converging to bad settings, thereby decreasing the playability of the optical record medium. This problem is solved by using a new criterion to calibrate the optical drive and improve the playability of the optical record medium, which comprises analyzing the header information. This method is useful in all optical drive systems such as CD, DVD and blu-ray players. | 09-11-2008 |
20080225661 | Optical Apparatus Capable of Generating Adaptive Control Signals - The present invention discloses an optical apparatus capable of reproducing/recording information from/to an optical carrier, e.g. a DVD or BD disk. The apparatus has control means for positioning/focusing a radiation beam ( | 09-18-2008 |
20080225662 | INFORMATION RECORDING MEDIUM, RECORDING APPARATUS, REPRODUCTION APPARATUS, RECORDING METHOD AND REPRODUCTION METHOD - An information recording medium is provided that includes a data area for recording user data and a defect management area for recording a defect list for managing N number of defect areas existing in the data area, where N is an integer satisfying N≧0. The defect list includes two or more blocks, and further includes a header located at a fixed position in the defect list and N number of defect entries, located subsequent to the header, including position information on the respective positions of the N number of defect areas. An anchor is located subsequent to the defect entries, and the header includes first update times information representing the number of times that the defect list has been updated. The anchor includes second update times information representing the number of times that the defect list has been updated. | 09-18-2008 |
20080225663 | METHOD AND APPARATUS FOR DETERMINING IF AN OPTICAL DISK ORIGINATED FROM A VALID SOURCE - A method and apparatus for determining if an optical disk originated from a valid source, the method and apparatus scanning one major surface of the optical disk for imperfections, storing the locations of the imperfections relative to a datum, comparing a parameter of each of the locations of the imperfections with corresponding parameters of a master disk of known source for determining if the disk originated from the source from which the master disk originated. | 09-18-2008 |
20080225664 | METHOD AND APPARATUS FOR MANAGING DEFECTS IN RECORDING MEDIA, A COMPUTER READABLE MEDIUM INCLUDING COMPUTER READABLE CODE FOR THE SAME, AND A DEFECT MANAGED RECORDING MEDIUM OBTAINED USING THE SAME METHOD, APPARATUS, AND COMPUTER READABLE MEDIUM - A method, apparatus and computer readable medium for managing recording medium defects and a defect managed recording medium. The recording medium includes a spare area in which a replacement area, which is a substitute for a defective area of the recording medium, is formed, and a temporary defect management area in which temporary management information that specifies the defective area and the corresponding replacement area is recorded, wherein position information and state information regarding the defective area are recorded in the replacement area. Accordingly, it is possible to restore defect information even if recording medium defect management on the recording medium ended abnormally. | 09-18-2008 |
20080232213 | Feedback Control Loop for Bit Detection in an N-Dimensional Data Block - On existing DVD and CD players a control loop is required for the adaptation and timing recovery. For Two-Dimensional Optical Storage such a control loop has drawbacks because PRML detection in the form of a stripe-wise Viterbi detector is used. Such a detector introduces an increasing detection delay when going from the outer rows towards the center of the broad spiral. A feedback loop is arranged to determining an error signal from a first area of the data block where the first area is that area where the error signal can be determined within the shortest period of time. This reduces the duration of the detection step and thus increases the stability of the control loop. | 09-25-2008 |
20080239902 | INFORMATION RECORDING APPARATUS AND INFORMATION RECORDING METHOD - According to one embodiment, an information recording apparatus comprises a recording unit which records information in blocks in a rewritable medium, a buffer which stores recording information of blocks while performing update, and stops the update of information when the write error is detected, an identifying unit configured to play back recording information of the information recording medium corresponding to the blocks when the write error is detected, and to identify a block including a write error occurring position based on whether a playback of the recording information has succeeded or not, and a re-recording unit configured to re-record the block identified by the identifying unit. | 10-02-2008 |
20080239903 | OPTICAL RECORDING MEDIUM RECORDING AND REPRODUCING APPARATUS AND TRACKING CONTROL METHOD - A tracking control is performed based on a first tracking error signal obtained from a first light beam reflected on an optical recording medium and a second tracking error signal obtained from a second light beam reflected on the optical recording medium. The first tracking error signal is corrected when recording information to or reproducing information from a first information recording layer that includes a first area facing an area on a second information recording layer with no information recorded and a second area facing an area on the second information recording layer with information recorded. | 10-02-2008 |
20080239904 | METHOD AND APPARATUS FOR INSPECTING A SURFACE OF A SPECIMEN - Inspection with respect to a defect on a surface of a substrate with an inherent or partial wave-like distortion is performed with high accuracy in consideration with the fluctuation caused by the wave-like distortion detected by the defect in excess of the signal level. The substrate is diagonally illuminated while being rotated and moved toward one axial direction to detect the specular reflected light and the scattered light. Based on the detected signal waveform, the state with respect to the inherent or partial wave-like distortion is determined. When the wave-like distortion exists in the substrate, the waveform is divided, and the threshold value is set for the divided regions. The signal higher than the threshold value will be output or displayed as the defect. | 10-02-2008 |
20080239905 | FOCUSING-ERROR DETECTING DEVICE AND HOLOGRAPHIC DATA-RECORDING/REPRODUCING APPARATUS HAVING THE DEVICE - In a device for detecting a focus error in controlling a position in an optical axis, a laser beam is split into first and second beam components, and one of the first and second beam components is diverged or converged. Then, the first and second beam components are superposed on each other, providing a single laser beam. The single laser beam is applied to an optical data-recording medium through an objective lens. The first laser beam component is focused on a first focusing point that is set at one side of the pinhole. The second beam component is focused on a second focusing point that is set at the other side of the pinhole. | 10-02-2008 |
20080239906 | Magnetic recording media, method for servowriting on same, and hard disk drive - Embodiments of the present invention provide a servo write medium, method and device for writing servo information by self servo write on the servo region formed from a flat section of the discrete track medium. The recording or write device yields the same servo characteristics as magnetic servo writing, is superior to pre-patterned servo, and delivers a greater write storage capacity with an even higher recording density. According to one embodiment, a self servo write method is used to write servo information on a flat section formed on a patterned disk on which discrete tracks are formed. Timing detection patterns (grooves) required for controlling the timing along the periphery during self servo write are formed by pre-patterning on the disk, and RRO error signals used for positioning control along the radius are written in the servo information on a flat section of the disk. | 10-02-2008 |
20080239907 | WRITE-ONCE READ-MANY INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD, INFORMATION REPRODUCTION METHOD, INFORMATION RECORDING APPARATUS, AND INFORMATION REPRODUCTION APPARATUS - A write-once read-many information recording medium is provided, which is capable of easily searching for a latest DDS and a latest defect list. At least one disc management working area is sequentially allocated in a predetermined direction on the write-once read-many information recording medium of the present invention. The latest defect list and the latest DDS are provided in a recorded disc management working area neighboring a border between the recorded disc management working area and an unrecorded disc management working area, where the latest defect list precedes the latest DDS in the predetermined direction. | 10-02-2008 |
20080239908 | Method of detecting optical disk error information - A method of detecting optical disc error information on an optical disc, for applying in an optical disc drive, the method comprising: first, detecting whether the optical disc is blank, if not, perform the following: checking whether a seek error occurred, if yes, recording a seek error mark; while reading a data region, recording data error information, the data error information comprises an error count, and a corresponding data error location; finally, outputting the optical disk error information according to the data error information and the seek error mark. | 10-02-2008 |
20080247287 | Disc Tilt Detecting Device - The invention relates to a device ( | 10-09-2008 |
20080247288 | Optical Disk Drive and Tracking Error Detection Method For an Optical Disk Drive - The present invention relates to a tracking error detection method for an optical storage system wherein an optical disk comprises a plurality of adjacent track portions with a radial track pattern in which a number n>2 of adjacent track portions repeatedly exhibit non-uniform radial track distances (TP | 10-09-2008 |
20080253249 | Optical disc - An optical disc includes a read-only area having a first wobble, which is a data wobble formed in the read-only area for only reading, a readable/writable area having a second wobble, which is different from the data wobble, and a connection area between the read-only area and the readable/writable area having a third wobble having the same frequency as one of the first and second wobbles. | 10-16-2008 |
20080253250 | Optical disc - An optical disc includes a read-only area having a first wobble, which is a data wobble formed in the read-only area for only reading, a readable/writable area having a second wobble, which is different from the data wobble, and a connection area between the read-only area and the readable/writable area having a third wobble having the same frequency as one of the first and second wobbles. | 10-16-2008 |
20080267029 | Method of Generating a Position Error Signal, Method of Writing a Data Track, and Method and Apparatus for Testing a Head - A method of generating a position error signal for a desired radial position of a read/write head relative to a data track of a disk is disclosed. The track has a plurality of servo bursts defining a plurality of servo nulls for the track, and are positioned such that they are at more than four different radial positions relative to the track, and define a predetermined locus having a known position relationship with the track. The method comprises determining a target null position on the null locus corresponding to the radial position of the head relative to the track; detecting the position of the servo null with the head; determining from the detected servo null position the position error of the head relative to the target null position; and, generating a position error signal. | 10-30-2008 |
20080267030 | DISK RECORDING DEVICE - The disk recording device of the present invention includes a recording means and a file system recording means. The recording means performs recording of an image signal upon a recordable type optical disk. The file system recording means includes an address information search means and an address information recording means. If the recording of the file system has failed, the address information recording means records the address information in the lead-in region, but does not thus record the address information if it is already recorded in the lead-in region, or the like. | 10-30-2008 |
20080273434 | Defect Management on File Level - A method of defect management is for use in recording information on a record carrier. A device for scanning a track on a record carrier reads blocks of information on logical addresses from corresponding physical addresses. The logical addresses are translated into the physical addresses in dependence on defect management information ( | 11-06-2008 |
20080279070 | Optical Data Storage System and Method of Optical Recording and/or Reading - An optical data storage system for recording and/or reading, using a radiation beam, having a wavelength λ, focused onto a data storage layer of an optical data storage medium is described. The system comprises the medium having a cover layer that is transparent to the focused radiation beam, an optical head, including an objective having a numerical aperture NA, said objective including a solid immersion lens that is adapted for being present at a free working distance of smaller than λ/10 from an outermost surface of said medium. The optical head comprises a first adjustable optical element corresponding to the solid immersion lens, means for axially moving the first optical element and dynamically keeping constant the distance between cover layer and solid immersion tens, a second adjustable optical element, means for dynamically adjusting the second optical element for changing the focal position of the focal point of the focused radiation beam relative to an exit surface of the solid immersion lens. This achieves reliable read-out and writing during cover layer thickness variations. Further a method is described for controlling such a system. | 11-13-2008 |
20080279071 | APPARATUS AND METHOD FOR DETECTING DEFECT OF OPTICAL DISC - A method for detecting a defect of an optical disc includes steps of: confirming an optical pickup head being accessing data in a track on state; determining a defective region of the optical disc according to a peak-to peak value of a wobble signal; and, maintaining the optical pickup head being unchanged when the defective region is detected. | 11-13-2008 |
20080279072 | RECORDING MEDIUM, RECORDING APPARTUS, REPRODUCTION APPARATUS, RECORDING METHOD AND REPRODUCTION METHOD - The present invention allows the usability of a write-once recording medium to be enhanced. The write-once recording medium is provided with an ordinary recording/reproduction area, an alternate area, a first alternate-address management information area (DMA) and a second alternate-address management information area (TDMA). In addition, written/unwritten state indication information (a space bitmap) is also recorded. The second alternate-address management information area is an area allowing alternate-address management information recorded therein to be renewed by adding alternate-address management information thereto. In addition, the written/unwritten state indication information indicates whether or not data has been recorded in each data unit (cluster) on the recording medium. Thus, it is possible to correctly execute management of defects and properly implement renewal of data in the write-once recording medium. | 11-13-2008 |
20080279073 | INFORMATION RECORDING MEDIUM, INFORMATION RECORDING METHOD AND INFORMATION RECORDING/REPRODUCTION SYSTEM - An information recording medium including a plurality of sectors of the present invention includes: a first spare area including a spare sector for replacing a defective sector among the plurality of sectors; a defect management information area for managing the replacement of the defective sector by the spare sector; and a volume space in which user data can be recorded. The volume space is configured so that a second spare area including a spare sector for replacing a defective sector among the plurality of sectors can be additionally allocated. Location information indicating a location of the second spare area is recorded in the defect management information area. | 11-13-2008 |
20080285408 | Optical Disk Device and Optical Disk Semiconductor - Search time increases if spherical aberration has to be varied for each radial location due to the influence of a disk or lens tilt. An optical disk device includes a spherical aberration search unit (spherical aberration setter | 11-20-2008 |
20080285409 | OPTICAL DISK DRIVE - An optical disk drive capable of reproducing data even when defects, such as flaws or stains, are present in the disk. A system controller of an optical disk drive reproduces data by setting the maximum speed in accordance with the type of an optical disk, an amount of side-to-side runout, and the like. When reproduction of data becomes impracticable for reasons of meandering of a track, or the like, in the middle of reproduction of data, the rotational speed is decreased, and a retry is performed. However, when reproduction of data becomes impracticable for reasons of flaws or stains, the rotational speed is reversely increased, and a retry is performed. | 11-20-2008 |
20080285410 | MULTI-LAYERED INFORMATION RECORDING MEDIUM, REPRODUCTION APPARATUS, RECORDING APPARATUS, REPRODUCTION METHOD, AND RECORDING METHOD - A multi-layered information recording medium comprising a plurality of recording layers, a user data area for recording user data, provided in at least two of the plurality of recording layers, and a defect list storing area for storing a defect list. When at least one defective area is detected in the user data area, the defect list is used to manage the at least one defective area. | 11-20-2008 |
20080291800 | MULTI-LAYERED INFORMATION RECORDING MEDIUM, REPRODUCTION APPARATUS, RECORDING APPARATUS, REPRODUCTION METHOD, AND RECORDING METHOD - A multi-layered information recording medium comprising a plurality of recording layers, a user data area for recording user data, provided in at least two of the plurality of recording layers, and a defect list storing area for storing a defect list. When at least one defective area is detected in the user data area, the defect list is used to manage the at least one defective area. | 11-27-2008 |
20080298190 | OPTICAL DISK APPARATUS AND OPTICAL DISK PROCESSING METHOD - According to one embodiment, an optical disk apparatus is provided with a read section which reads data from an optical disk to output read information, a determination section which determines presence/absence of an error of the read information to output an error presence/absence signal, a transfer processing section which receives the error presence/absence signal and receives a hash request signal and transfers the hash request signal when the error presence/absence signal indicates the absence of an error, and does not transfer the hash request signal when the error presence/absence signal indicates the presence of an error, and a processing section which performs hash processing to the read information upon reception of the hash request signal. | 12-04-2008 |
20080304382 | Drive Device - A drive apparatus of the present invention includes a recording/reproduction section and a drive control section. The drive control section at least performs a process including: allocating a contiguous area to a specific location in the user data area other than the location specified by the recording instruction; controlling the recording/reproduction section to record the data in the allocated contiguous area; and generating new disc management information including first replacement management information for mapping a start location of the contiguous area specified by the recording instruction to a start location of the allocated contiguous area and second replacement management information for mapping an end location of the contiguous area specified by the recording instruction to an end location of the allocated contiguous area. | 12-11-2008 |
20080304383 | PLAYBACK DEVICE AND MANAGEMENT INFORMATION ACQUIRING METHOD - A playback device includes a reading section that performs reading from a recording medium, and a control section that acquires the latest temporary management information recorded last on the recording medium. The control section executes a read control process of controlling the reading section so that when reading pointer information in a temporary management information unit recorded last in a temporary management information unit recording area, reading of data is executed from a predetermined position located before a segment in which the pointer information is included, and an information acquiring process of executing a process for acquiring the temporary management information pointed to by the pointer information from the data read in response to the read control process. | 12-11-2008 |
20080304384 | METHOD OF AND APPARATUS FOR MANAGING DISC DEFECTS USING TEMPORARY DEFECT MANAGEMENT INFORMATION (TDFL) AND TEMPORARY DEFECT MANAGEMENT INFORMATION (TDDS), AND DISC HAVING THE TDFL AND TDDS - A disc having an updatable defect management area used by an apparatus for managing defects on the disc, the disc including a user data area which includes user data, a spare area that is a substitute area for a defect existing in the user data area, and an area in which are recorded an address of data that is last recorded in the user data area and an address of a replacement data recorded in the spare area. Accordingly, the disc defect management method and apparatus are applicable to a recordable disc such as a write-once disc while effectively using a defect management area of the disc. | 12-11-2008 |
20080304385 | INFORMATION-RECORDING SYSTEM AND METHOD, PROGRAM-STORING MEDIUM, AND PROGRAM - An information recording system, where new data recording is started from LRA (old) and a record error is detected, at position P | 12-11-2008 |
20080310272 | Method and Recorder for Reducing Rejection of Record Carriers Due to Write Errors - When writing on a recordable medium the recorder can encounter write errors. When a write error occurrs the record carrier is discarded. By ignoring write errors in sections of the record carrier comprising unused information, for instance sections of the lead-in or lead-out the record carrier no longer needs to be discarded. | 12-18-2008 |
20080310273 | CIRCUIT FOR GENERATING TRACKING ERROR SIGNAL - A circuit for generating a tracking error signal is provided. The circuit includes a digitized circuit, a short signal removing circuit and phase comparator. The digitized circuit receives first and second pick-up signals outputted from a pick-up head, and respectively compares the first and the second pick-up signals with a reference signal to obtain a first digital signal and a second digital signal. The short signal removing circuit is used for removing pulses in the first and the second digital signals, wherein the pulse width of the removed pulses are shorter than a preset time, and the first and second digital without the removed pulses are respectively served as a first determining signal and a second determining signal. The phase comparator receives the first determining signal and the second determining signal for outputting the tracking error signal according to a phase difference between the first and the second determining signals. | 12-18-2008 |
20080316884 | MULTI-LAYERED INFORMATION RECORDING MEDIUM, REPRODUCTION APPARATUS, RECORDING APPARATUS, REPRODUCTION METHOD, AND RECORDING METHOD - A multi-layered information recording medium comprising a plurality of recording layers, a user data area for recording user data, provided in at least two of the plurality of recording layers, and a defect list storing area for storing a defect list. When at least one defective area is detected in the user data area, the defect list is used to manage the at least one defective area. | 12-25-2008 |
20090003168 | Optical disc device | 01-01-2009 |
20090003169 | OPTICAL DISC APPARATUS, OPTICAL DISC APPARATUS CONTROLLER AND DEFECT DETECTION METHOD - According to one embodiment, An optical disc apparatus includes a decoder including branchmetric calculation section configured to calculate a branchmetric for the signal generated by executing a predetermined process on read signal obtained from a optical disc, pathmetric selection section configured to select a maximum likelihood pathmetric according to the branchmetric calculated by the branchmetric calculation section and a path memory having memory stages, each consisting of memory elements, configured to obtain a decoded signal by shifting the information to be stored in the memory to a memory of a subsequent stage according to the outcome of selection of the pathmetric selection section, and defect detection section configured to detect a defect of the optical disc according to the information possessed by the memory of the last stage or of a specific stage of the path memory. | 01-01-2009 |
20090010122 | Aberration Detector and Optical Pickup With Same - The first polarizing hologram element ( | 01-08-2009 |
20090010123 | Data recording/reproduction method and data recording/reproduction apparatus - A data recording/reproduction method for performing a data recording/reproduction process on a flexible optical disk by rotating the flexible optical disk while controlling an axial runout of the flexible optical disk with a stabilizing member that applies an aerodynamic force to the flexible optical disk, and irradiating an optical beam and focusing the optical beam to the flexible optical disk is disclosed that includes the steps of a) generating a first axial runout, b) generating a focus error signal forming an S-curve when the first axial runout is generated, c) determining a position of the optical beam according to the focus error signal, d) generating a second axial runout that is smaller than the first axial runout after step c), and e) conducting at least one of the data recording process and the data reproduction process after step d). | 01-08-2009 |
20090010124 | METHOD AND AN APPARATUS FOR RECORDING INFORMATION, AND AN INFORMATION RECORDING MEDIUM - In a method for recording information on an information recording medium having a data recording area for storing user data and a test area used for test recording by a recording apparatus, it is detected whether the test area is unusable when executing the test recording. The test recording is executed in the test area when the test area is detected not to be unusable, or executed in the data recording area when detected to be unusable. Management information relating to the test recording executed in the data recording area is recorded in a predetermined area. Hence, it is possible to eliminate a limit of number of times of test recording which depends on the size of the test recording area. | 01-08-2009 |
20090010125 | METHOD AND APPARATUS FOR MANAGING DISC DEFECTS USING UPDATEABLE DMA, AND DISC THEREOF - A disc defect management method and apparatus using a defect management area that can be updated, and a write once disc incorporating the method. A data area is disposed between a lead-in area and a lead-out area. The disc includes a defect management area (DMA) that is present in at least one of the lead-in area or the lead-out area, wherein defect information and defect management information are repeatedly recorded in the DMA according to a recording operation. Accordingly, the disc defect management method and apparatus enable effective use of the defect management area. The method is also applicable to a multi layer disc having a user data area on each layer. The defect information and the defect management information for an individual defect may include cumulative defect information and defect management information related to previously identified defects. | 01-08-2009 |
20090022024 | METHOD AND APPARATUS FOR DETECTING OPTICAL DISK STATE - This disclosure concerns an optical disk state detection apparatus comprising a defect detector to which a signal read from an optical disk is imparted, the defect detector detecting a defect to supply a defect detection signal; rotation synchronous pulse generator supplying a rotation synchronous pulse in synchronization with rotation of the optical disk; a memory in which the defect detection signal is stored, the defect detection signal being imparted to the memory; a write circuit performing write processing of data to the memory; a read circuit performing read processing of data from the memory; and a system controller which controls the read circuit such that the defect detection signal is written in the memory in synchronization with the rotation synchronous pulse and such that the defect detection signal is read at least one time every one rotation of the optical disk from the memory in synchronization with the rotation synchronous pulse. | 01-22-2009 |
20090028021 | Radial To Focus Cross Talk Cancellation In Optical Storage Systems - A signal processing technique is proposed for compensating for radial to focus crosstalk in an optical storage system including an astigmatic lens ( | 01-29-2009 |
20090028022 | SINGLE SPOT CROSS-CORRELATION TRACKING - A tracking error (TE) signal is formed from a single spot on a photodetector | 01-29-2009 |
20090034382 | OPTICAL DISC, RECORDING APPARATUS, READING APPARATUS, RECORDING METHOD AND READING METHOD - An optical disc | 02-05-2009 |
20090034383 | DISK-SHAPED RECORD MEDIUM AND PRODUCING METHOD FOR SAME, DISK RECORDING METHOD AND DEVICE, AND DISK PLAYBACK METHOD AND DEVICE - To record specific information to a disk-shaped record medium and reproduce the recorded specific information without any influence on the error correction capability. Copy protection information (CPID) having an error correction code appended thereto, shuffled and otherwise treated is sent as a CPID bit block to an EDC rewrite circuit ( | 02-05-2009 |
20090046552 | MEDIUM CONTROL DEVICE, MEDIUM CONTROL METHOD, AND RECORDING MEDIUM - A medium control device for accepting a medium, reading from or writing to the medium, and monitoring for errors that occur while reading or writing provides a quality determiner for determining whether the quality of the medium has deteriorated based on errors by monitoring for the errors that occur while reading or writing, and a quality marker for marking a message indicating deterioration of the quality of the medium on a label side of the medium when the quality determiner determines that the quality of the medium has deteriorated. | 02-19-2009 |
20090052289 | SYSTEM AND METHOD OF DEFECT DESCRIPTION OF A DATA STORAGE MEDIUM - The disclosure is directed toward systems and methods of defect description of a data storage medium. In a particular embodiment, a method includes determining a first defect of a data storage medium. The method also includes determining a format of an entry of a defect description table based on the first defect and a location of a second defect of the data storage medium. The format is selected from one of a plurality of formats. The method also includes storing a description of the first defect in the entry of the defect description table in the format. | 02-26-2009 |
20090059751 | OPTICAL DISC APPARATUS AND DATA RECORDING/REPRODUCING APPARATUS - A recording/reproducing apparatus capable of encrypting bus data to a host has a bus encryption circuit and controls the access to a memory. Encryption of data between the recording/reproducing apparatus and the host can be achieved to assure protection of data and contents recorded on an optical disc. | 03-05-2009 |
20090080304 | INFORMATION RECORDING MEDIUM, RECORDING AND/OR REPRODUCING APPARATUS, AND RECORDING AND/OR REPRODUCING METHOD - An information recording medium, recording and/or reproducing apparatuses, and recording and/or reproducing methods which enable effective management of a last data recording address of a data area of the information recording medium. The information recording medium includes a data area for recording user data, temporary recording management information for managing a data recording status of the data area and temporary disc management information for managing the information recording medium, wherein the temporary disc management information includes first information regarding a last recorded location of data in the data area and second information regarding whether the information regarding the last recorded location is consistent with an actual last recorded location of the data area. | 03-26-2009 |
20090086598 | SERVO FRAME INTERVAL CORRECTION APPARATUS, STORAGE APPARATUS AND SERVO FRAME INTERVAL CORRECTION METHOD - One aspect of the embodiment utilizes a servo frame interval correction apparatus which includes a detection unit for detecting a first servo frame formed on said recording medium. The apparatus includes an acquiring unit acquiring a detection time interval between said first servo frame and a second servo frame detected subsequently to the first servo frame from a table storing a detection time interval between a specific servo frame and a servo frame detected subsequently to the specific servo frame. The apparatus includes a differential calculation unit calculating a differential between the detection time interval acquired by said acquiring unit and a reference time interval; and a correction unit correcting an estimated position of said second servo frame based on the differential calculated by said differential calculation unit. | 04-02-2009 |
20090086599 | OPTICAL DISC APPARATUS AND TRACKING CONTROL METHOD - According to one embodiment, an optical disc apparatus includes a pickup which receives reflected light from an optical disc, a tracking error detecting section which detects a tracking error from an output signal of the pickup, a reproducing section which reproduces data in a phase lock state of a data phase, the data lock state being detected by a phase lock loop based on the output signal of the pickup, and a control section which renders a tracking servo of the pickup for the optical disc valid when a residual component of an error detection signal from the tracking error detecting section in a tracking servo-on state falls within a predetermined allowable range, and renders the tracking servo of the pickup invalid with release of the phase lock state. | 04-02-2009 |
20090092018 | RECORDING MODULATION CIRCUIT, RECORDING MODULATION METHOD AND OPTICAL DISK APPARATUS - After a transfer error detection circuit detects a transfer error that transfer data from a memory controller to a recording modulation circuit is delayed for a recording clock process, the number of transfer errors is counted in units of sync frame in a transfer error count circuit. When the number of transfer errors is n times (n: positive integer) or less, the modulation and recording operation are continued as it is and the NRZI output operation is performed from the correct position while applying a sync, and when the number of transfer errors is n times or larger, the recording operation is interrupted and the re-recording is performed from the interrupted location thereafter. | 04-09-2009 |
20090109817 | MEDIA DISC RELIABILITY - Damage to removable or non-removable media or to content on the media may prevent access to content on the media. A processor may recognize a defect in the media, for example, due to read errors. The processor may request a “clean” (i.e., undamaged) or replaceable version of the non-readable media content. The processor may request the content over a network. The processor may store the requested content in local storage, such as in the cache or more permanent memory. The processor may read the requested portion directly over the network or from the stored location, rather than reading the damaged portion from the removable media. Once stored locally, the clean version may be available for subsequent access. Subsequently, the processor may request previously stored content from local storage without needing to request content over the network. | 04-30-2009 |
20090109818 | Optical disc recording and reproducing apparatus - A DSP of the DVD recorder includes a balance value setting portion for determining an appropriate value of a focus balance value α when information is reproduced from an optical disc so as to record the determined focus balance value α | 04-30-2009 |
20090109819 | Optical pickup - A spherical aberration correction mechanism includes a plurality of aberration correction lenses, a movable portion in which the aberration correction lens is held, a fixed portion in which the movable portion is arranged so as to be slidable as well as the aberration correction lens is held, a shaft supporting the movable portion so as to be rotatable about the axis as well as to be slidable in the axial direction, a feed screw having spiral grooves, an engaging portion having convex portions to be engaged with the spiral grooves from one direction and a coil spring fitted to the outside of the shaft, pressing the movable portion in the axial direction. The coil spring has a rotation prevention portion engaged with the fixed portion and a torque biasing portion engaged with the movable portion, and the coil spring is installed in a twisted state in advance. | 04-30-2009 |
20090122677 | Recording medium, method and apparatus for managing a file system information of the recording medium - A recording medium, method and apparatus for managing a file system information of the ‘recording medium are disclosed. Herein, information for identifying a file system type (or a file system identifier) within a high density recording medium, such as a blu-ray disc, is recorded, and such a file system identifier is used in the method and apparatus for recording and reproducing the recording medium. The file system identifier is also used in a method for recording the file system identifier and initializing the same, when initializing the recording medium. | 05-14-2009 |
20090141602 | RECORDING MEDIUM STRUCTURE CAPABLE OF DISPLAYING DEFECT RATE - A recording medium structure capable of displaying a defect rate is provided. The recording medium has at least one use area with endurance blocks, and each endurance block has an endurance value. The recording medium structure has a housing, a first and a second off-line display units arranged on the housing for respectively displaying a real defect rate and a potential defect rate of the recording medium. The real defect rate is calculated based on an error correction coed, and the potential defect rate is calculated based on an endurance values recorded in the endurabce table. | 06-04-2009 |
20090147642 | APPARATUS FOR AND METHOD OF DETECTING TRACKING ERROR SIGNALS - An apparatus for detecting a tracking error signal includes an optical detector to receive light beams reflected from an optical disc and having a plurality of detecting regions; and a phase difference extracting unit to extract a phase difference between a pair of optical signals output from the optical detector, wherein the phase difference extracting unit repeatedly moves a first graph representing one optical signal from among the pair of optical signals by a predetermined distance with respect to a second graph representing another optical signal from among the pair of optical signals, the first and second graph represent optical signal values with respect to t-axis, adds differences between optical signal values of the first graph and optical signal values of the second graph corresponding to predetermined positions of the t-axis, the adding differences is repeated for each of the repeatedly moved positions of the first graph, and outputs a moved distance of a position where the added value is smallest as a phase difference. | 06-11-2009 |
20090161512 | METHOD FOR ACCESSING DEFECT MANAGEMENT DATA - A method for accessing defect management data includes reading the required data block in an optical disc when an optical disc drive receives a command, storing data in a first buffer area, caching the required defect management data from a data cache area; otherwise, reading the required defect management data from a defect management area of the optical disc, storing the required defect management data in a second buffer area, checking if the required defect management data is hot defect management data, copying the hot defect management data to the data cache area, replacing the defect data of the first buffer area with the required defect management data, and outputting the data of the replaced first buffer area to expedite the reading process. | 06-25-2009 |
20090175147 | Reducing written-in errors in servo patterns - A method for writing servo onto a disk of a hard disk drive. The method includes writing a plurality of spiral servo signals with a head. The spiral servo signals are used to generate position error signals and write a plurality of servo patterns. A write current of the head is varied for at least one servo pattern. A PES/WC relationship between the position error signals and the write current is determined and a plurality of final servo patterns are written by utilizing the PES/WC relationship and varying the write current. Varying the write current changes the trailing edge of the servo bits and controls the position of the track center. The PES/WC relationship allows the system to compensate for excursions within a single revolution of the disk. | 07-09-2009 |
20090207708 | OPTICAL DISC DEVICE - An optical disc device capable of preventing a current larger than prescribed in specifications from flowing by measuring amounts of variation in drive signals of the actuator or the spindle motor, and in view of a correlation between those amounts of variation in the drive signals and the amount of current, changing the servo control system characteristics according to measured amounts of variation, and setting a limit to the level of drive signals. | 08-20-2009 |
20090252010 | OPTICAL DISK DRIVE WITH DISK TYPE DETERMINATION AND METHOD OF DETERMINING A DISK TYPE OF AN OPTICAL DISK WITH AN OPTICAL DISK DRIVE - An optical disk drive and a method for determining a disk type are described. The optical disk drive may be arranged to receive a radial error signal while an incident beam is focused onto the optical disk and before tracking the track, to analyze the radial error signal for detecting whether a wobble signal is present, indicating whether the track is wobbled, and to derive a disk type from the wobble signal, if present. The optical disk drive may additionally or alternatively be arranged to receive a central aperture signal while the incident beam is focused onto the optical disk and before tracking a track including a sequence of embossed pits, to analyze the signal amplitude of the central aperture signal, and to determine the disk type from at least a first variation of the signal amplitude of the central aperture signal as a function of time. | 10-08-2009 |
20090262617 | INFORMATION RECORDING DEVICE - An information recording device is provided, which is capable of performing physical reformatting at a high speed while avoiding unnecessary substitution processing after the physical reformatting. A disc recording and reproduction drive | 10-22-2009 |
20090268574 | OPTICAL DISC DRIVE AND METHOD OF CONTROLLING THE SAME - A method of controlling an optical disc drive to drive a multi-layer optical disc includes acquiring actual optimal aberration correction positions of a first layer and a second layer of the multi-layer optical disc while a position of an aberration correction unit is changed, positioning the aberration correction unit at an intermediate point between the aberration correction position of the first layer and the aberration correction position of the second layer, performing a layer jump from the first layer to the second layer of the optical disc, and positioning the aberration correction unit at the aberration correction position of the second layer. | 10-29-2009 |
20090285067 | BACK-UP METHOD FOR DEFECTIVE DATA - A back-up method for defective data includes: first writing a batch of data clusters on a user data area; reading the data clusters to check for defects; planning back-up positions on the back-up area; writing the correct data for the defective data clusters to form a batch of corresponding replacing blocks; reading the replacing blocks to check defects; planning back-up positions on the back-up area; and writing the correct data for the batch of replacing blocks in order until the rewritten replacing blocks do not contain defects. | 11-19-2009 |
20090290463 | OPTICAL DISC DEVICE - The optical disc apparatus of this invention includes: an optical pickup, which irradiates an optical disc with a light beam and generates a light detection signal based on the beam reflected from the disc; a search section, which controls the pickup before data is written on a storage area of the disc, thereby adjusting the beam spot location and searching a reference one of information layers stacked for a defective area in the storage area of the disc; a defect decision section for detecting an error based on the detection signal and determining a portion of the storage area, where the error has occurred, as the defective area; a defect size measuring section for measuring the size of the defective area in an area of the reference layer and generating a defect information list indicating there is the defective area in the area of the reference layer; and a recording range control section for managing, by reference to the list, the storage area such that no data will be written on a perpendicularly projected area defined by projecting the defective area of the reference layer perpendicularly to another information layer. | 11-26-2009 |
20090296549 | Optical Disk Device - The precision of a direction detection signal DIR is judged from the duty ratio of the direction detection signal DIR, and the direction detection signal DIR which is used for track search control or tracking pull-in control is judged as valid or invalid according to the precision, thereby to improve the precision of the track search control or the tracking pull-in control. Therefore, even when the direction detection is not performed accurately due to a difference in the reflected light quantity on the optical disk, a defect on the optical disk, a delay in the track cross speed during search, or a delay in the detection circuit, the track search control and the tracking pull-in control can be performed with stability. | 12-03-2009 |
20090316548 | DATA PROCESSING APPARATUS AND METHOD FOR REPRODUCING DATA OF AN OPTICAL RECORDING MEDIUM - A data processing apparatus utilized for reproducing data from an optical storage medium has individual checking modules for separately controlling a data outputting operation of a data buffering unit according to the data buffered in the data buffering unit and a primary defect list, and for controlling a decoding operation of a decoding unit according to the data stored in a memory unit and a secondary defect list. The flow path of the related data processing method is therefore simplified because all the checking operations of the defective status of the data read from the optical storage medium are accomplished by the checking modules. | 12-24-2009 |
20090316549 | OPTICAL DISK DRIVE FOR SCANNING AN OPTICAL DISK WITH A SCANNING VELOCITY AND METHOD FOR SCANNING AN OPTICAL DISK WITH A SCANNING VELOCITY - An optical disk drive and a method for scanning an optical disk that includes a substantially circular track with a scanning velocity is provided. A servo control signal (SCS) is determined based on a servo error signal (SES). A first performance indicator (IND | 12-24-2009 |
20100027397 | TRACKING BY CROSS CORRELATING CENTRAL APERTURES OF MULTIPLE BEAMS - The present invention provides a method and apparatus for robust tracking at narrow track-pitches on optical discs, enabling higher densities on Blu-ray Discs ( | 02-04-2010 |
20100039913 | METHOD FOR PERFORMING SERVO DEFECT COMPENSATING OPERATION BY COMPENSATING SERVO-RELATED SIGNAL DERIVED FROM READING OPTICAL MEDIUM AND RELATED OPTICAL DISC DRIVE SYSTEM WITH DSP - A method for performing a servo defect compensating operation by compensating a servo-related signal in an optical disc drive and a related optical disc drive system with a DSP is provided. The method comprises: reading an optical medium by an optical pick-up unit; detecting whether a defect exists by monitoring a side beam signal; when the defect on the optical medium is detected, determining a new compensation value based on a servo error signal; and compensating the servo-related signal with the new compensation value during defect crossing to adjust servo control when the optical pick-up unit passes the defect. | 02-18-2010 |
20100046340 | OPTICAL DRIVE DEVICE AND AMPLIFICATION RATE DETERMINING METHOD - An optical drive device generates a fist push-pull signal and a first sum signal based on a light receiving amount in two light receiving areas of which each width in a signal light tangent direction is smaller than a diameter of a spot of signal light, generates a first normalized push-pull signal by normalizing the first push-pull signal by using the first suits signal, and generates a tracking error signal based on the first normalized push-pull signal. | 02-25-2010 |
20100067339 | OPTICAL DISC DEVICE - It is determined whether an error will occur due to presence of a defective area like a bubble and the storage area is managed according to the size of the defective area such that no data is written on the defective area once an error has occurred. An optical disc apparatus includes: an optical pickup for irradiating an optical disc with a light beam and generating a light detection signal on the beam reflected from the disc; a search section for searching, before data is written there, the storage area on the disc for any defective area by controlling the pickup to shift the light beam spot on the disc; a defect decision section for determining, if an error has been detected based on the light detection signal, a part of the storage area where the error has occurred to be a defective area; a size measuring section for measuring the size of the defective area and generating a defect information list to locate the defective area; and a recording range control section for managing the storage area by reference to the defect information list such that no data is written on the defective area. | 03-18-2010 |
20100074078 | Systems and Methods for Low Latency Media Defect Detection - Various embodiments of the present invention provide systems and methods for media defect detection. For example, a media defect detection systems is disclosed that includes a data input derived from a medium, a fast envelope calculation circuit that receives the data input and provides a fast decay envelope value based on the data input, a slow envelope calculation circuit that receives the data input and provides a slow decay envelope value based on the data input, and a media defect detection circuit. The media defect detection circuit receives the slow decay envelope value and the fast decay envelope value, calculates a ratio value of the fast decay envelope value to the slow decay envelope value, and asserts a defect output based at least in part on the comparison of the ratio value to a defect threshold value. | 03-25-2010 |
20100085852 | WRITE-ONCE OPTICAL RECORDING MEDIUM AND DEFECT MANAGEMENT INFORMATION MANAGEMENT METHOD THEREOF - A write-once optical recording medium, a method for allocating a defect management area of the write-once optical recording medium, and a method for allocating a spare area of the write-once optical recording medium are provided. A method of managing defects on a write-once optical recording medium having at least one recording layer includes the steps of allocating at least one temporary defect management area having a fixed size and at least one temporary defect management area having a variable size to said optical recording medium, respectively, recording defect management information on the at least one temporary defect management area having a fixed size and the at least one temporary defect management area having a variable size; and using the at least one temporary defect management area having a fixed size and the at least one temporary defect management area having a variable size is provided herein. | 04-08-2010 |
20100091627 | OPTICAL DISK INSPECTION DEVICE AND INSPECTION METHOD - There is provided an optical disk device which quickly inspects the presence or absence of a defect in an optical disk in order to ensure that it can be played back on various types of optical disk devices. A detection unit uses signals supplied from a playback unit to detect defects from each of an RF signal, a focus error signal, and a tracking error signal. A CPU stores positions of the defects in a memory. The playback unit plays back data while degrading playback conditions at the positions of the defects . The detection unit detects an error rate of the played-back data, and finally determines whether the optical disk is “OK” or “NG”. | 04-15-2010 |
20100097907 | WRITE ONCE DISC, DISC DRIVE THEREFOR, AND METHOD OF MANAGING DISC DEFECT CONSIDERING COMPATIBILITY WITH REWRITABLE DISC DRIVE - A write once disc, a disc drive therefor, and a method of managing disc defects on the write once disc using the disc drive in consideration of the compatibility of the write once disc with a rewritable disc drive, the write once disc includes a single record layer disc in which a lead-in area, a data area, and a lead-out area are sequentially formed and a first spare area and a second spare area are sequentially formed in the data area. The write once disc includes a defect management area (DMA) formed in at least one of the lead-in area and the lead-out area; a first temporary defect management area (TDMA) formed in at least one of the lead-in area and the lead-out area; and a second TDMA formed between the first spare area and a user data area or between the user data area and the second spare area. | 04-22-2010 |
20100110853 | METHOD FOR INSPECTING OPTICAL INFORMATION RECORDING MEDIUM, INSPECTION APPARATUS, OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING METHOD - A method for inspecting an optical information storage medium includes the steps of: irradiating the storage medium with a laser beam and rotating the medium by a constant linear velocity control technique by reference to the radial location at which the laser beam forms a spot on the medium; changing the rotational velocities according to the radial location on the medium between at least two linear velocities that include a first linear velocity Lv | 05-06-2010 |
20100110854 | DISK DEVICE, AND DATA MOVING PROGRAM AND METHOD - A disk device that records information on a storage medium includes a first reading-out section that reads out defective address information in which a defective address indicative of a physical position of a defective part of the storage medium is recorded; a blocking section that, when a value of intervals between a plurality of the defective addresses in the defective address information which has been read out by the first reading-out section is less than a specific value in terms of a specific unit, sets the specific unit as a defective block; a second reading-out section that reads out data fin the defective block set by the blocking section; and a writing section that writes the data which has been read out by the second reading-out section into an area different from the defective block in the storage medium based on the specific unit. | 05-06-2010 |
20100118673 | METHOD FOR INSPECTING OPTICAL INFORMATION RECORDING MEDIUM, INSPECTION APPARATUS, OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING METHOD - A method for inspecting an optical information storage medium includes the steps of: irradiating the storage medium with a laser beam and rotating the medium by a constant linear velocity control technique by reference to the radial location at which the laser beam forms a spot on the medium; changing the rotational velocities according to the radial location on the medium between at least two linear velocities that include a first linear velocity Lv | 05-13-2010 |
20100118674 | SYSTEM AND METHOD FOR COMBINING PRE-MASTERED ERRORS WITH MARKS OR PRINTED SPOTS ON OPTICAL MEDIA - An optical article for playback in a player, the optical article including at least one sector having data, and a mark disposed in a predetermined relationship with the at least one sector, wherein the mark renders a portion of the data generally unreadable. The optical article further includes error correction code associated with the at least one sector, wherein data within the error correction code is configured as partially corrupted. The inclusion of partially corrupted error correction code reduces the size of the mark or spot required to render the data sector uncorrectable. | 05-13-2010 |
20100149939 | OPTICAL DISC RECORDING METHOD AND OPTICAL DISC APPARATUS - This document relates to a method capable of reducing transfer errors of a sled motor for moving an optical pickup to the outer circumference when labels are recorded on a disc. An optical disc recording method may comprise checking a step pattern having a small transfer error in the sled motor, and recording labels on a label plane of an optical disc while driving the sled motor based on the checked step pattern. Step patterns can be classified based on a structure of the sled motor or a unit for driving the sled motor. The step patterns having a small transfer error can be detected in a process of manufacturing an optical disc apparatus and stored in memory of the optical disc apparatus. | 06-17-2010 |
20100177610 | OPTICAL DISK DEVICE FOR MULTI-LAYER OPTICAL DISK AND MULTI-LAYER OPTICAL DISK - An optical disk device for writing data into a disk including a plurality of recording layers, wherein the disk includes a recording layer in which a track for recording the data is formed in a clockwise spiral direction, and a recording layer in which a track for recording the data is formed in a counter-clockwise spiral direction, and the optical disk device records the data into a first recording layer, and selects a layer in which the data can be recorded and of which a spiral direction is opposite to the spiral direction of the first recording layer, as a recording layer for recording the data next to the first recording layer. | 07-15-2010 |
20100226228 | RECORDING AND REPRODUCING APPARATUS AND METHOD - The invention solves the problem that data cannot be recorded on a disc because the number of registered Defect Lists (DFLs) has reached a limit and the problem that the access performance is reduced at recording data reproduction time. A cluster, which is normally reproduced during verification processing and is preceded and followed by one or more defective blocks, is also treated as a defective block and, together with the preceding and following defective clusters, recorded in an spare area for extending the range in which clusters are registered as Contiguous Re-allocated Defect (CRD) entries. This reduces the number of DFLs to solve the problem that data cannot be recorded on the disc and, in addition, reduces the number of seek operations to prevent the access performance from being reduced at reproduction time. | 09-09-2010 |
20100232276 | DEFECT MANAGING METHOD AND DEFECT MANAGING DEVICE - To enable sequential recording to be performed to alternate destinations and improve in access performance, by controlling to estimate sequential defective areas such as bubbles based on prescribed conditions, allocate blocks of a spare area ( | 09-16-2010 |
20100246354 | SYSTEM AND METHOD FOR READING MICRO-HOLOGRAMS WITH REDUCED ERROR RATES - The present techniques provide methods and systems reading a data bit of interest on an optical data disc with a reduced error rate. The data bit estimation may be improved by reducing deterministic noise resulting from an optical reader system and/or the optical data disc. The reader may adjust the position of a detector to detect light scattered from the disc based on parameters of known noise sources. In one embodiment, the detector may be moved vertically in relation to the data bit of interest on the optical disc. In another embodiment, more than one detector may be used to detect light scattered from a data bit of interest. In embodiments, the positioning of the detector(s) may be based on system or disc parameters, and the detected scatterings may provide a data reading, improved for an optical return from a present micro-hologram. | 09-30-2010 |
20100309765 | WRITE ONCE DISC ALLOWING MANAGEMENT OF DATA AREA, METHOD OF MANAGING THE DATA AREA, AND APPARATUS AND METHOD FOR REPRODUCING DATA FROM WRITE ONCE DISC - A write once disc allowing management of a data area, a method of managing the data area of the write once disc, an apparatus recording data on the write once disc, an apparatus and method of reproducing data from a write once disc. The write once disc, includes a lead-in zone, a data area, and a lead-out zone. The write once disc includes a predetermined area storing area allocation information which indicates whether at least one section of the data area is allocated for disc defect management. In the disc and method, area allocation information specifying a structure of the data area is recorded on the disc, thus allowing a recording/reproducing apparatus to recognize the data area structure. Therefore, allocating areas, such as a spare area, for disc defect management other than an area for storing user data, to the data area is possible. The allocation of the areas for disc defect management to the data area enables effective use of the write once disc. | 12-09-2010 |
20100322050 | WRITE-ONCE RECORDING MEDIUM, A RECORDING APPARATUS AND A REPRODUCING APPARATUS FOR A WRITE-ONCE RECORDING MEDIUM - A drive apparatus of the present invention includes a recording/reproduction section and a drive control section. The drive control section performs a process including: determining whether or not replacement management information including a replacement physical address is found in the replacement management information list, the replacement physical address matching the physical address corresponding to the logical address included in the recording instruction, when the replacement management information is not found, as a first time pseudo-overwrite recording for a location indicated by the physical address corresponding to the logical address included in the recording instruction, performing a process; and when the replacement management information is found, as a second time or more pseudo-overwrite recording for a location indicated by the physical address corresponding to the logical address included in the recording instruction, performing a process. | 12-23-2010 |
20120113782 | STORAGE MEDIA DEFECT DETECTION - Detecting a defect on a storage device is disclosed. Detecting includes receiving a signal read from a storage device, sampling the signal to obtain a set of signal samples, wherein the sampling starts at an arbitrary time, computing a defect value for a defect type using the set of signal samples, comparing the defect value with a threshold associated with the defect type, determining whether there is a defect of the defect type based at least in part on the comparison, and in the event that a defect is detected, outputting an indication associated with the defect. | 05-10-2012 |
20120113783 | INFORMATION RECORDING MEDIUM, RECORDING/REPRODUCING APPARATUS, AND RECORDING/REPRODUCING METHOD TO DISTINGUISH BETWEEN AN ORIGINAL RECORDING BLOCK AND A REPLACEMENT RECORDING BLOCK - An information recording medium, and a recording/reproducing apparatus and a recording/reproducing method for the recording medium. Original data is sequentially updated by replacing an original recording block with one or more replacement recording blocks. A replacement recording block includes at least one of an original address field indicating a location of the original recording block or a previous address field indicating a location of an immediately previous recording block. Replacement information is effectively recovered in a system where a replacement for logical overwriting (LOW) occurs in either a spare area and a user data area by reference to the address fields in each replacement recording block. | 05-10-2012 |