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| Number | Title | Issue Date |
| 8179625 | Method for fast verification of servo patterns and test on magnetic media High density magnetic disks are each placed on testers. Each tester tests a portion of the disk. If the tester finds an error, a new disk is placed on the tester. The tester goes to the allocated portion of the disk and tests whether the error is on the new disk. Th... | 05/15/2012 |
| 8179626 | Adaptive shock detection Adaptive shock detection systems are provided according to various embodiments of the present invention. In one embodiment, an adaptive shock detection system comprises a shock sensing circuit, and a controller configured to receive shock detection signals from the ... | 05/15/2012 |
| 8174783 | Testing magnetic disk performance with a single slider simulating sliders of various disk drive systems Magnetic disk drive systems and associated methods are described for testing magnetic disk performance for certification with a plurality of magnetic disk drive systems prior to installation. The test system may position a slider at a first spacing between the magne... | 05/08/2012 |
| 8174781 | Method for screening magnetic-recording heads A method for screening a magnetic-recording head utilizing a simulated-cross-track-gain profile of the magnetic-recording head to provide a manufacturing-qualified, magnetic-recording head. The method includes measuring a track profile of the magnetic-recording head... | 05/08/2012 |
| 8174779 | Discrete device testing One embodiment in accordance with the invention is a method that comprises testing a first number of physical devices using a first test sequence that comprises an item. A second number of physical devices are tested using a second test sequence. It is noted that th... | 05/08/2012 |
| 8174782 | Methods for depositing lubricant onto disks and systems thereof A system in one embodiment includes a disk; a reservoir having a selectively openable cover; a lubricant in the reservoir; and a sensor for detecting an event or condition that triggers opening of the cover. A method in another embodiment includes determining that a... | 05/08/2012 |
| 8174780 | Disk drive biasing a refresh monitor with write parameter of a write operation A disk drive is disclosed including a disk, and a head actuated over the disk. Control circuitry within the disk drive is operable to receive a write operation for a refresh zone of the disk, measure a write operation quality parameter that affects the quality of th... | 05/08/2012 |
| 8169725 | Hard disk drive and method for managing scratches on a disk of the hard disk drive A method for managing scratches on a disk of a hard disk drive is disclosed. By dividing the disk into a plurality of evaluation groups, testing each evaluation group for defects, calculating line equations based on the detected defects and determining whether the d... | 05/01/2012 |
| 8154811 | Measuring reader/writer offset in a tape drive head In a method of electronically measuring reader/writer offset in a tape drive head, a plurality of sequentially adjacent data tracks are written on a tape with a write head. Error rate information is measured while reading a data track of the plurality of sequentiall... | 04/10/2012 |
| 8154812 | Condensing a defect scan log for a disk of a disk drive The embodiments relate to optimizing a defect log of a storage device, such as a disk drive. The defect log may comprise entries for individual locations, such as sectors on a disk, and entries indicating zones. A zone comprises a plurality of locations in the mediu... | 04/10/2012 |
| 8149528 | Disk drive connecting defect shapes to preempt data loss A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. A first defect shape is detected during a manufacturing defect scan of the disk. A second defect shape is detected while the disk drive is deployed in-the-field. ... | 04/03/2012 |
| 8139300 | Magnetic recording medium evaluation apparatus and evaluation method This invention provides a magnetic recording medium evaluation apparatus and evaluation method which yield results having good correlation with error rate measurements even when comparing media with different structures. Signals from a function generator are recorde... | 03/20/2012 |
| 8134791 | Disc operation selection A method of identifying a string or chain of efficient or “good enough” disc operations for processing (a pseudo optimal chain) is provided. A “pseudo optimal chain” comprises a string or chain of operations that, while not necessarily the optimal string or ... | 03/13/2012 |
| 8130457 | Magnetic recording/reproducing apparatus and method for determining magnetic recording condition A magnetic recording/reproducing apparatus 100 includes: a magnetic head 1; a magnetic recording medium 2; a spindle 3 and a spindle motor 4; a suspension arm 5; a voice coil motor 6; and a control unit 7. The ... | 03/06/2012 |
| 8125723 | Predictive characterization of adjacent track erasure in recording media Cross-track density capability is predicted for a large number of writes based on a plurality of erase band width measurements. Over the plurality of erase band width measurements, a number of writes in a series of writes performed as part of an aggressing track seq... | 02/28/2012 |
| 8125724 | Predictive characterization of adjacent track erasure in recording media A wide area track erasure (WATER) rate of change is determined from a model generated from a plurality of track erasure measurements performed on a magnetic recording media. A model of the change in noise amplitude for an off-track position as a function of the numb... | 02/28/2012 |
| 8120867 | Apparatus and methods of generating a test pattern of data, analysing a test pattern of data, and testing a data storage disk medium and/or a read/write head A method of generating a test pattern of data to be written to a data storage disk medium for testing includes: rotating the disk; detecting fluctuations in the speed of rotation of the disk; producing a reference clock signal in accordance with the fluctuations so ... | 02/21/2012 |
| 8120866 | Method for characterizing a magnetic-recording system for the presence of adjacent-track interference and far-track interference A method for characterizing a magnetic-recording system for the presence of adjacent-track interference and far-track interference. The method includes writing a plurality of repeating pulse-waveforms on a data track of a magnetic-recording disk at a write element o... | 02/21/2012 |
| 8116021 | Synchronized rewriting of data A hard disk drive (HDD) including a magnetic disk, the magnetic disk including a data track. The HDD also includes a synchronized rewrite controller for synchronizing a plurality of rewrites of a data pattern on a location of the track of the magnetic disk and the H... | 02/14/2012 |
| 8116020 | Disk drive mapping entries of a defect list into clusters A disk drive is disclosed comprising a first and second disk surfaces. A defect list is generated comprising a plurality of entries, wherein each entry comprises a track number comprising a defect. A first cluster across the first and second disk surfaces is identif... | 02/14/2012 |
| 8111473 | Method to evaluate a data storage device using magnetic spacing losses A method of evaluating the performance of a magnetic recording system, comprising measuring a first set of finite impulse response filter tap values at time t1, measuring a second set of finite impulse response filter tap values are measured at time t2... | 02/07/2012 |
| 8102614 | Storage system, related data processing apparatus, and I/O method A storage system is disclosed and related methods of reading/writing data are disclosed. The storage system includes a main data storage medium, and first and second buffers storing data to be stored on the main data storage medium, as well as a controller defining ... | 01/24/2012 |
| 8102613 | System, method and apparatus for determining track pitch in a hard disk drive to satisfy the requirements of both off-track capacity and adjacent track erasure Track pitch in a hard disk drive is selected to satisfy the requirements of both off-track capacity (OTC) and adjacent track interference (ATI). The invention separately measures the track pitch requirements for OTC and ATI. The track pitch for the drive is set with... | 01/24/2012 |
| 8094396 | Media defect scan A disk drive is disclosed comprising a disk, a head for writing data to the disk, and control circuitry coupled to the head. The control circuitry is operable to write data to the plurality of data tracks, read a first data area of a first data track to generate a f... | 01/10/2012 |
| 8089712 | Abnormality determining apparatus In a RAID apparatus, an error determining processing unit determines whether an HDD is normal based on an error determining condition obtained from an amount of increase of NON MEDIUM ERROR COUNT and the number of accesses memorized on a control table, and detects t... | 01/03/2012 |
| 8089713 | Detection of hard-disc defect regions using soft decisions In a hard-disc drive, a defect region on the hard disc is detected by generating two statistical measures (e.g., β1(k) and β2(k)) based on signal values (e.g., x[n] or y[n]) and soft-decision values (e.g., L[n]) corresponding to the signal va... | 01/03/2012 |
| 8089714 | Deterioration detection method of composite magnetic head and magnetic disk inspection apparatus An object of the present invention is to provide a deterioration detection method of a head and a magnetic disk inspection apparatus in which the number of times of exchanging the head due to deterioration is decreased to improve the throughput of an inspection. In ... | 01/03/2012 |
| 8068298 | Harmonic selection for track following on a hard disk drive Harmonic selection for track following is described for a hard disk drive comprising at least one magnetic disk capable of storing data and spinning, a controller capable of controlling a read/write head capable of reading and writing data while following a track on... | 11/29/2011 |
| 8054567 | Method for measuring write/read width of a composite magnetic head and a measuring device using the method Test data is written in tracks of a discrete track medium by making the tracks eccentric by accessing a plurality of tracks by forcibly making a composite magnetic head eccentric under an ON track servo control. The test data written in the tracks which are pseudo-e... | 11/08/2011 |
| 8049981 | Method of controlling a filter coefficient of a continuous time filter and data storage device thereof A method of controlling a filter coefficient of a continuous time filter of a data storage device is provided. The method of controlling filter coefficient includes positioning a magnetic head at a first reference height from surface of a magnetic disk and outputtin... | 11/01/2011 |
| 8049980 | Partial disk failures and improved storage resiliency A mass data storage system including a hard disk drive comprising heads and platter surfaces determines when a head of the disk is faulty and the disk continues to operate as a partially failed disk with respect to the remaining heads which are not faulty. A striped... | 11/01/2011 |
| 8045281 | Method of setting write factor in hard disk drive and hard disk drive using the same A method of setting write factors of each head in a hard disk and a hard disk drive using the method. The method includes writing a write signal onto a test track based on a write factor initially set on the magnetic head, writing the write signals onto the tracks a... | 10/25/2011 |
| 8045282 | Measurement of track eccentricity on bit patterned media The eccentricity of tracks defined on a rotating bit patterned media are measured using a readback signal, and the measured eccentricity may be used to control centering of the disk relative to a rotational spindle and/or to control movement of a read/write head rel... | 10/25/2011 |
| 8045283 | Amplitude-based approach for detection and classification of hard-disc defect regions In a hard-disc drive, a defect region on the hard disc is classified as corresponding to either thermal asperity (TA) or media defect (MD) by generating two statistical measures. A first measure (e.g., α1) is based on (i) the magnitudes of one or both of... | 10/25/2011 |
| 8040625 | Condensing a defect scan log for a disk of a disk drive A disk drive to condense a defect scan log for a disk is disclosed. The disk drive comprises: a disk including a plurality of tracks having a plurality of wedges; a head to perform read operations from the disk including reading defects on the disk; and a processor.... | 10/18/2011 |
| 8037348 | Vibration-aware data reassignment An aspect of the present disclosure relates to implementing a temporary reassignment of data based on a vibration condition. An exemplary method includes implementing a data operation for a portion of data and detecting a data error during the data operation. The me... | 10/11/2011 |
| 8031420 | Frequency-based approach for detection and classification of hard-disc defect regions In a hard-disc drive read channel, frequency-based measures are generated at two different data frequencies (e.g., 2T and DC) by applying a transform, such as a discrete Fourier transform (DFT), to signal values, such as ADC or equalizer output values, corresponding... | 10/04/2011 |
| 8031421 | Method for measuring optimum seeking time and inspection apparatus using the same The present invention provides a method for measuring an optimum seeking time and an inspection apparatus using this method capable of measuring and setting an optimum seeking time for inspection of a magnetic disk or magnetic head. The method samples average level ... | 10/04/2011 |
| 8031422 | Accumulator for non-return to zero (NRZ) linear feedback shift register (LFSR) in controller for disk drive A disk controller for a hard disk drive includes a disk formatter interfaced via an NRZ bus to a read channel for the disk. The disk formatter includes an LFSR accumulator coupled to the NRZ bus, as well as an LSFR generator that generates synthetic test data for th... | 10/04/2011 |
| 8027110 | Apparatus for measuring magnetic field of microwave-assisted head A measurement circuit system of a magnetic field measurement apparatus of the present invention includes an amplifier, a mixer circuit and a band-pass filter that are connected in order on an output end side of a microstrip line or a coplanar wave guide, which is an... | 09/27/2011 |
