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| Number | Title | Issue Date |
| 8081396 | Processing data recorded on a tape medium A device for processing data recorded on a tape medium includes a first control part that controls a read head to read specific data recorded in a first area among data recorded in a first format on the tape medium. Data in the first format is recorded at a first re... | 12/20/2011 |
| 8059353 | Magnetic storage systems and methods allowing for recovery of data blocks written off-track with non-constant offsets A magnetic storage system includes a disk, a head, an actuator, a read channel, and a main controller. The main controller causes the head to read a data block of a selected track of the disk at each of a plurality of fixed offsets from a center of the selected trac... | 11/15/2011 |
| 8004785 | Disk drive write verifying unformatted data sectors A disk drive is disclosed comprising a disk having a plurality of data sectors, wherein a physical block address (PBA) is associated with each data sector. When a write command is received from a host to write user data to the disk, and the write command comprises a... | 08/23/2011 |
| 8000052 | Cartridge refresh and verify A method according to one embodiment of the present invention includes receiving an instruction to perform a verification operation on a media cartridge having a tape wrapped around a spool; unwrapping at least some of the tape from the spool of the media cartridge;... | 08/16/2011 |
| 7986480 | Micro-journaling of data on a storage device Embodiments of the present invention recite a method of preserving data on a hard disk drive. In one embodiment, a first copy of data is read from at least one sector of a hard disk drive and stored in a first location. A second copy of the data is stored in a non-v... | 07/26/2011 |
| 7965463 | Recording multiple codeword sets during latency period Writing data to magnetic tape is performed by receiving data from a host, establishing sub data sets, computing C1 and C2 ECC, forming Codeword Quad sets, writing a beginning Data Set Separator to a magnetic tape, writing a plurality of contiguous instances of the C... | 06/21/2011 |
| 7952826 | Method operating hard disk drive on the basis of predicted defect using hierarchical clustering and curve fit A method of operating a hard disk drive (HDD) on the basis of a predicted new defect in a disk associated with the HDD is disclosed. The method includes detecting defects in a magnetic surface of the disk, defining a plurality of clusters by grouping the detected de... | 05/31/2011 |
| 7924522 | Apparatus and method of detecting error symbol, and disk drive apparatus using the same An apparatus and a method of detecting an error symbol in a data storage apparatus so that an error correcting performance of an error correction decoder. The error symbol detecting apparatus includes an equalizer equalizing a signal transmitted to a channel using a... | 04/12/2011 |
| 7920350 | Adaptive data recovery procedure based on radial positioning Data recovery information characterizes data recovery procedure (DRP) steps to be performed within a hard disk drive (HDD) in response to a miss. Particular data recovery information corresponds to a radial position of the actuator and, therefore, the position of th... | 04/05/2011 |
| 7911725 | Hard disk, control unit for a disk device, and method for controlling a disk device A hard disk includes: a plurality of servo areas which are elongated radially from a center of the hard disk to an outward thereof over tracks thereof; and a plurality of data areas which are respectively provided between the plurality of servo areas; wherein altern... | 03/22/2011 |
| 7903361 | Method of detecting scratch defect in circumferential direction and magnetic disk certifier In the present invention, an inspection area for sampled defect data is set which has a predetermined width in the radial direction of a magnetic disk and a length round the circle of the magnetic disk in the circumferential direction thereof or a predetermined leng... | 03/08/2011 |
| 7898757 | Hard disk drive with divided data sectors and hard disk drive controller for controlling the same A hard disk drive controller includes a buffer block temporarily storing recording data received from a host or reproduced data to be output to the host. A formatter outputs the recording data or the reproduced data and outputs a first control signal and a second co... | 03/01/2011 |
| 7898758 | Systems and methods for storing data to magnetic tape having damaged areas A method for using magnetic tape having damaged areas is disclosed. The method may include writing data to streaming magnetic tape, determining if the data write was successful, and responding to an unsuccessful data write by interrupting the data writing and advanc... | 03/01/2011 |
| 7885028 | Data error recovery using voting on multiple retrials A hard disk drive with a disk that has a plurality of data bits. The drive includes a circuit that reads each data bit n times and selects a value for the bit based on the most frequent occurrence of one of a plurality of values. This process provides a voting techn... | 02/08/2011 |
| 7885027 | Magnetic disk drive with error correction Embodiments of the present invention provide a magnetic disk drive in which the error correction capability of ECC is improved without sacrificing the storage capacity. In one embodiment, a data track adopts a format structure in which no data-to-data gap area is fo... | 02/08/2011 |
| 7880993 | Storage device, defect detection method and program for detecting defect in recording medium The present invention provides a technique for detecting a defect in a tape medium within a relatively short or narrow range. A tape defect detection device includes: a read unit for reading data from a tape medium; an error correction unit for performing error corr... | 02/01/2011 |
| 7880994 | Vibration detection for data storage device and write processing method for data storage device In a data storage device, a head writes data so as to protect data from off track writing to adjust tracks. A control unit acquires large ring buffer during sequential writing and performs a retry to return adjacent tracks, according to data of a return sector area ... | 02/01/2011 |
| 7876518 | Certify testing apparatus and certify testing method An apparatus is provided that can detect error locations in certify testing of a magnetic recording medium without influence from undulation of the substrate or irregularities in film thickness distribution of magnetic film of the magnetic recording medium. Such an ... | 01/25/2011 |
| 7859784 | Data storage device and adjacent track rewrite processing method A data storage device, that stores write data by a head, rewrites data on an adjacent track at a timing which is different from write retry of detecting a head off track when data may be written to an adjacent track. When an off track error, which affects data on an... | 12/28/2010 |
| 7852586 | Device and method for scanning data stored on a recording medium The invention concerns a method and a device for scanning data stored on a recording medium. The device comprises a reading head and further comprises: means to calculate an error rate of the data read by said reading head, said da... | 12/14/2010 |
| 7848041 | Method and apparatus for correcting data errors in a disk drive According to one embodiment, a disk drive that includes a disk and a disk controller is provided which effectively correct data errors that are generated at the time of reproducing data. The disk has a data-recording area constituted by a set of magnetic dots that a... | 12/07/2010 |
| 7843660 | Disk drive adjusting erasure window based on a number of non-read data sectors during a retry operation A disk drive is disclosed comprising a disk having a plurality of data tracks, wherein each data track comprises a plurality of data sectors. A head is actuated radially over the disk in order to read one of the data sectors from a target data track on the disk. The... | 11/30/2010 |
| 7813070 | Error correction capability for longitudinal position data in a tape storage system A longitudinal position (LPOS) word L(n) is encoded with error correction capability. The LPOS word includes a plurality of LPOS symbols L0(n) through Lk(n) calculated as L ... | 10/12/2010 |
| 7813069 | Method and apparatus for controlling motion of storage media A method of controlling relative motion of a data storage medium on which data is stored in data groups comprising tracks extending across the storage medium and a rotatable transducer for reading data from the storage medium includes determining from the data group... | 10/12/2010 |
| 7787205 | Detecting and correcting insertion and deletion of bits for bit patterned media storage systems A method of determining errors in a data storage device is disclosed. The disclosed method includes receiving a first code word from the data storage device. The method further includes determining whether a data error exists in the code word by analyzing a pluralit... | 08/31/2010 |
| 7773329 | Correcting errors in a disk drive read back signals by iterating with the Reed-Solomon decoder A signal detector includes a detector to generate raw decisions based on a read back signal. A post-processor identifies possible defects in the raw decisions. A selector selects a portion of the possible defects, and generates modified decisions by operating on the... | 08/10/2010 |
| 7751138 | Correcting errors in disk drive read back signals by iterating with the Reed-Solomon decoder A signal detector is provided to detect symbols in a read back signal. The signal detector includes a first detector to generate raw decisions as a function of the read back signal and to generate at least one next best decision. A list-aided decoder generates the f... | 07/06/2010 |
| 7738205 | Recording disk drive and method of managing defective regions in the same Embodiments in accordance with the present invention relate to identifying an address of user data to be registered as a defective user data address in disk defect inspection. In an embodiment of the present invention, in the state where a write element is positione... | 06/15/2010 |
| 7715139 | Method of testing magnetic disc device A write head, which is positioned by reading a servo pattern with a read head, writes data on even tracks of a magnetic disc, and then writes data on odd tracks. Then a read head is positioned on a read position and sequentially reads all the written data. As a resu... | 05/11/2010 |
| 7715140 | Method of determining size of error and write control method for hard disc drive, hard disc drive using the write control method, and media storing computer programs for executing the methods A method of determining a size of an error generated in a servo sector, a write control method of controlling whether to write data to data sectors successive to a servo sector according to the size of the error generated in the servo sector therein, a HDD using the... | 05/11/2010 |
| 7697226 | Control apparatus, storage apparatus, and computer product A rewrite determining unit acquires, for every servo frame recorded on a magnetic disk, an amplification degree, i.e., a gain of an amplifier circuit by which a read signal read from the magnetic disk is amplified to a predetermined output, determines a rewrite sect... | 04/13/2010 |
| 7667912 | Retry and re-read for write synchronization A method of detecting a cycle slip in a data string read from a bit patterned media and adjusting the data string to compensate for the cycle slip is disclosed. A system including a writeable data storage medium and a compensator configured to adjust data read from ... | 02/23/2010 |
| 7639444 | Real-time channel adaptation Disclosed is a technique for updating a read-detect channel. A signal is processed in a read-detect channel that has one or more programmable registers. While signals continue to be processed by the read-detect channel, it is determined with a channel auxiliary proc... | 12/29/2009 |
| 7636216 | Method of determining head characteristic of HDD and recording medium to perform the same A method of determining a head characteristic, i.e. determining whether a head has a write characteristic stronger or weaker than that of a normal write head, and a recording medium suitable to perform the method. The method includes detecting a first error rate by ... | 12/22/2009 |
| 7636217 | Defect inspection method of magnetic disk, device therefor, and magnetic disk drive device Embodiments of the present invention efficiently conduct a test for detecting defects on a magnetic disk more accurately. According to one embodiment, a HDD carries out defect inspection of a magnetic disk using thermal fly height control (TFC). Changing a clearance... | 12/22/2009 |
| 7583461 | Defect registration method of magnetic disk, and magnetic disk drive Embodiments of the present invention provide a defect registration method for performing defect registration of sectors on a magnetic disk. In one embodiment, a rectangular detection window is applied to each defect sector. A threshold value of the detection window ... | 09/01/2009 |
| 7580214 | Retry and re-read for write synchronization A method of detecting a cycle slip in a data string read from a bit patterned media and adjusting the data string to compensate for the cycle slip is disclosed. A system including a writeable data storage medium and a compensator configured to adjust data read from ... | 08/25/2009 |
| 7573667 | Servo information write method and apparatus Embodiments of the invention provide a servo information write method that makes it possible to properly locate the last-written servo information even when old servo information is overwritten by new servo information. In one embodiment, a servo track writer contro... | 08/11/2009 |
| 7570447 | Storage control device and method for detecting write errors to storage media There are provided a cache region that stores write data from a host device, storage media, a data storage region for the storage media, and a comparison unit. A first comparison object is generated for N items of write data on the cache region and the N items of wr... | 08/04/2009 |
| 7545594 | Method and system for removing signal defects in MR head signals The disclosure describes a data storage system that includes a signal defect correction system for removing signal defects in magnetoresistive head playback signals. The signal defect correction system utilizes a matched finite impulse response (FIR) filter and digi... | 06/09/2009 |
