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| Number | Title | Issue Date |
| 6934105 | Tape reposition minimization using multiple reads The present invention decreases the number of repositions during read back by making use of multiple read elements associated with each data track. A tape system includes a tape head with two read elements associated with each data track to be simultaneously read. E... | 08/23/2005 |
| 6931586 | Error correction method for high density disc An error correction method for optical discs, and more particularly, an error correction method appropriate to high density discs is provided. The error correction method adds inner parity and outer parity to an error correction block of size n byte×m×o. The metho... | 08/16/2005 |
| 6931576 | Data integrity device providing heightened error protection in a data processing system Various embodiments of systems and methods of providing heightened data integrity in a data processing system are disclosed. A data processing system may include a host computer system, an interconnect coupled to the host computer system, and a storage array coupled... | 08/16/2005 |
| 6927930 | Adaptive data format method integrating spare sectors The performance capability of different heads that are part of the same hard disk drive (HDD) are utilized by an adaptive format that includes a plurality of storage zones and at least one reset zone that are distributed along a radius of the hard disk such that a r... | 08/09/2005 |
| 6925580 | Full volume slip defect management in a disc drive A method and device for mapping an inherently defective sectors or newly-identified defective sectors in a disc drive to a good sector in the disc drive in such a way that data fragmentation is minimized and that speed efficiency in accessing the data stored in the ... | 08/02/2005 |
| 6922801 | Storage media scanner apparatus and method providing media predictive failure analysis and proactive media surface defect management A method, computer readable medium, apparatus and RAID controller for performing nondestructive write testing is disclosed. For data storage devices divided into sectors, the present invention performs nondestructive write testing by writing data to the sectors, rea... | 07/26/2005 |
| 6920003 | Data storage reading device and method A processor processes data read from plural data tracks on a data-containing medium. The data tracks include markers. The processor determines if markers are detected in a predetermined number of the tracks within a predetermined time interval starting with detectio... | 07/19/2005 |
| 6920591 | Measuring an error rate in a communication link An error rate detector is provided. The error rate detector includes a sequence generator that is adapted to generate a test sequence for comparison with a received sequence. The error rate detector also includes a self synchronization circuit that is responsive to ... | 07/19/2005 |
| 6920005 | Storage apparatus and read error recovery method thereof A storage apparatus provided with an error recovery procedure (ERP) and a read error recovery method in the storage apparatus. The read error recovery method, in which a plurality of error recovery operations are sequentially performed, includes applying parameters ... | 07/19/2005 |
| 6920007 | Load/unload method and a magnetic disk drive using the method To control load/unload operation of a slider with magnetic head mounted thereon, by which the speed can always be controlled stably while avoiding the slowdown or temporary stop of an actuator during load/unload operation, a magnetic disk drive is configured using m... | 07/19/2005 |
| 6917485 | Dynamic head switch timing recalibration apparatus and method An apparatus and method for dynamic head switch timing recalibration are provided. With the apparatus and method, a determination is made as to whether a difference in a reference head switch timing and the head switch timing at a later time is sufficient to meet a ... | 07/12/2005 |
| 6914948 | Media noise post-processor with varying threshold A post-processing method and circuit (30) for correcting media noise errors and producing a corrected recovered data output signal (49) is disclosed for use in a sampled data read channel of a mass data storage device. The mass data storage device has ... | 07/05/2005 |
| 6912104 | Timing based servo pattern incorporating band encoding Identification of servo tracks is provided by adding one or more additional symbols to the write elements of at least some tracks on a servo recording head. The additional symbols are ignored for timing purposes, as they are not necessarily symmetrical, but the adde... | 06/28/2005 |
| 6912682 | Signal processor for correcting and detecting errors A signal processor performs error correction on data which has been subjected to predetermined signal processing, for each predetermined block unit, by an error correction block, in parallel with an operation of sequentially storing the data in a cache memory. Then,... | 06/28/2005 |
| 6912100 | Device and signal processing circuit for magnetic recording, magnetic recording apparatus A magnetic recording/reproducing apparatus includes a partial-response equalization circuit having frequency characteristic of cutting off low-frequency signal components inclusive of DC components; and a maximum-likelihood decoder, in which a reproduced signal outp... | 06/28/2005 |
| 6910100 | Detecting open write transactions to mass storage In accordance with some embodiments of the present invention, an indicator may be provided to indicate whether a write transaction to a drive of an array of drives has completed. If the write transaction has not been completed, a recovery may be performed in some em... | 06/21/2005 |
| 6906883 | Servo defect management scheme in hard disk drives The present disclosure relates to a system for detecting a plurality of defect types on the surface of a disk in a hard disk drive. In particular, the disclosure relates to utilizing information obtained from a plurality of servo bits to determine if a sector contai... | 06/14/2005 |
| 6906889 | Magnetic disk drive A magnetic disk drive has a low power consumption state in which the spindle motor is stopped for reducing the average power consumption when no read or write commands have been received. When a read or write command is received, the spindle motor is started. The ti... | 06/14/2005 |
| 6906881 | Apparatus and method to erase a magnetic tape A method to erase a magnetic tape, where the magnetic tape is first mounted in a magnetic tape in a tape drive, where that magnetic tape includes a physical beginning of tape (“PBOT”), a physical end of tape (“PEOT”), and information written thereon between ... | 06/14/2005 |
| 6906987 | Method and apparatus of recording data optimally onto a speed-changing disk The present invention relates to method and apparatus of recording data onto a disk recording medium in zoned-CLV mode while adjusting recording speed and recording condition adequately at every speed change point between zones. The present invention detects a curre... | 06/14/2005 |
| 6906878 | Method and system for implementing in situ low flyheight warning A method and apparatus are provided for implementing in situ low flyheight warning in a direct access storage device (DASD). For each head in the DASD, a readback amplitude ratio is identified from two different disk radii. The initial ratio value is stored for each... | 06/14/2005 |
| 6906989 | Apparatus and method for searching for defective address of recording medium An apparatus for searching for defective address of recording medium includes a recording unit, a converter, and a comparator. The recording unit is configured to record a defect list recorded in an recording medium using physical addresses. The defect list includes... | 06/14/2005 |
| 6904559 | Error correction method in full response read channels The present invention provides an error correction method that is used in full response read channels. This method includes the steps of: obtaining a read signal from a storage medium and converting the read signal into channel bits that are recorded in the storage ... | 06/07/2005 |
| 6903887 | Multiple level (ML), integrated sector format (ISF), error correction code (ECC) encoding and decoding processes for data storage or communication devices and systems A method and an apparatus encodes and decodes blocks having a predetermined number of sectors of data bytes to detect and correct data bytes in error in each sector of a block. The method and the apparatus generates sector level check bytes for each sector in the bl... | 06/07/2005 |
| 6903889 | Method and apparatus for tuning a magnetoresistive bias parameter in a data storage system A method of tuning a bias parameter for a magnetoresistive head in a data storage system includes the step of identifying, from multiple possible bias parameter values, a smallest bias parameter value for the magnetoresistive head which both maintains a bit error ra... | 06/07/2005 |
| 6903890 | Method and apparatus for write compensation of perpendicular magnetic recording in disk drive There is disclosed a write compensator which suppresses bit shift caused by distortion of a read signal waveform of a read head in a disk drive adopting a perpendicular magnetic recording system. The write compensator executes write compensation during recording dat... | 06/07/2005 |
| 6903892 | Minimization of tape repositions using multiple read elements per track The present invention decreases the number of repositions during read back by making use of multiple read elements associated with each data track. Each of a plurality of sets of read electronics receives the read signal from either one or the other of the two read ... | 06/07/2005 |
| 6898036 | System and method for recovery from writing errors during data storage A system and method for recovering from write errors during writing of a moving storage medium suspend write current while allowing the storage medium to continue moving. The system and method continue to format data for writing while the write current is suspended ... | 05/24/2005 |
| 6898033 | Anticipating media decay in a disc drive A procedure for estimating bit error rate (BER) for disc media in a disc drive is disclosed. Initially, the BER estimation procedure writes random data to specified tracks on the disc media. The procedure then reads the specified tracks over predefined time interval... | 05/24/2005 |
| 6894489 | TESTING APPARATUS FOR CONDUCTING A TEST ON A MAGNETIC RECORDING MEDIUM OR A MAGNETIC HEAD, THROUGH RECORDING TEST DATA ON THE MAGNETIC RECORDING MEDIUM AND REPRODUCING RECORDED TEST DATA THEREFROM BY MEANS OF THE MAGNETIC HEAD A testing apparatus of a magnetic recording medium for conducting a test on the magnetic recording medium by using reproduced data obtained through reproduction of the magnetic medium, including a plurality of conversion means for converting the reproduced data into... | 05/17/2005 |
| 6895500 | Disk drive for receiving setup data in a self monitoring analysis and reporting technology (SMART) command A disk drive is disclosed for receiving a Self Monitoring Analysis and Reporting Technology (SMART) command from a host computer. The disk drive comprises a plurality of configuration parameters stored in a non-volatile manner for configuring at least one system whe... | 05/17/2005 |
| 6894855 | Magnetic disk drive including read channel for processing differentiated read signal A disk drive of perpendicular magnetic recording method including a read head comprising a GMR element and a drive using a double-layered disk medium, is disclosed. In the magnetic field response characteristic of the GMR element, the relationship between the degree... | 05/17/2005 |
| 6891690 | On-drive integrated sector format raid error correction code system and method An encoding system and associated method protect against miscorrection due to parity sector correction in, for example, an on-drive RAID system. The system adds a parity cluster block, which itself is a complete, C3-protected cluster. Having the cluster level, C4 le... | 05/10/2005 |
| 6891689 | Apparatus for reading data In an apparatus for reading recorded data, the apparatus, a read signal is sampled from recorded data of a recording medium by synchronizing with a first clock signal. A sample value obtained by the sampling part is stored and also the sample value from the first st... | 05/10/2005 |
| 6883122 | Write pass error detection A data reader is arranged to read data comprising user data 30 and non-user data 32, 34 written across at least two channels of a data-holding medium 10, said data being arranged into a plurality of data items 26 each containing user data... | 04/19/2005 |
| 6882489 | Dynamic off-track detector A method and apparatus for dynamically detecting write fault errors is provided. According to the invention, transducer head control parameters are adjusted according to observed events. For instance, off-track events of a certain magnitude may trigger the implement... | 04/19/2005 |
| 6879456 | Disk drive writer with active reflection cancellation A write driver circuit selectively provides a write current through a write head in first and second opposite directions. The write driver circuit is connected to the write head through an interconnect. The write driver circuit provides an incident write current sig... | 04/12/2005 |
| 6876316 | Separation enhanced gray codes A method and computer program for generating a K-bit Gray code comprises (a) selecting a M-bit Gray code number from a M-bit Gray code having a one-bit separation I and a two-bit separation J; (b) selecting a N-bit Gray code number from a N-bit Gray code, wherein K=... | 04/05/2005 |
| 6877127 | Quality control in data transfer and storage apparatus Data from a host computer is buffered, transferred to a logical formatter, compressed and converted to a format suitable for storage on a magnetic tape before being arranged and written sequentially into a main buffer where parity bytes are added as each row of a da... | 04/05/2005 |
| 6873486 | Apparatus for measuring lateral shift of running magnetic tape To measure a lateral shift of running magnetic tape caused by a lateral movement of the magnetic tape which occurs while the magnetic tape is running, a fixed write head H1 of a measurement apparatus 10 magnetizes part of the running magnetic tape MT i... | 03/29/2005 |
