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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...
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8179627 |
Floating guard band for shingle magnetic recording
A hard disk drive that includes a disk with data written onto a plurality of tracks, a spindle motor that rotates the disk, and a head that is coupled to the disk. The disk drive also includes a...
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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...
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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...
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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...
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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...
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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...
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8174785 |
Method and apparatus for detecting rapid off track following and protecting nearby tracks from rapid off track writing in a hard disk drive
This application discloses a hard disk drive using a self-resonant frequency band of a Voice Coil Motor far above its operational frequency band to predict Rapid Off Track events before its head...
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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,...
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8169726 |
Disk file preamplifier frequency-response and time delay compensation
An apparatus including one or more reader circuits, one or more writer circuits, and a loopback channel. The one or more reader circuits may be configured to read data from a magnetic medium. The...
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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...
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8164846 |
Hybrid defect detection for recording channels
Methods, systems and computer program products for performing hybrid defect detection are disclosed. A hybrid defect detection mechanism may be used to detect various classes of defects (e.g., long...
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8159771 |
Controlling a heat resistive element with a pulse modulated signal
The disclosure is related to pulse width modulating a power signal to a heat resistive element of a transducer. The power signal may be a power output signal of preamplifier. The power signal may...
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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...
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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...
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8149527 |
Systems and methods for reducing attenuation of information derived from a defective medium
Various embodiments of the present invention provide systems and methods for data regeneration. For example, a method for data regeneration is disclosed that includes receiving a data input derived...
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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...
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8144412 |
Magnetic disk device having mechanism for detecting projections on recording medium
A thin film magnetic head includes a medium projection detection mechanism that detects a projection on the surface of a recording medium. The medium projection detection mechanism has a...
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8144418 |
Test device for magnetic storage device, magnetic storage device, and method of manufacturing magnetic storage device
According to one embodiment, a test device for a storage device includes: a module configured to acquire from the storage device a value corresponding to a signal level read from a magnetic disk...
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8144419 |
Disk drive detecting head touchdown from microactuator signal
A disk drive is disclosed comprising a head actuated over a disk surface by a microactuator, and a fly height actuator operable to adjust a fly height of the head. A servo control voltage is...
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8142693 |
Stamper and stamper evaluation method
According to one embodiment, letting Vf be a maximum voltage value level within the range of a frequency 60 to 170 times the rotational speed of a stamper and Vave be the average sum signal voltage...
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8139306 |
Electrical current as probe for modulation at head-disk interface
A system and method for measuring the modulation between a magnetic head and a magnetic storage medium, such as a disk, is disclosed. A magnetic read/write head is positioned above a magnetic...
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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...
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8139305 |
Systems and methods for timing and gain acquisition
Various embodiments of the present invention provide systems and methods for acquiring timing and/or gain information. For example, various embodiments of the present invention provide data...
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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 o...
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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...
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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...
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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...
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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;...
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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...
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8122294 |
Apparatus, system, and method for rapid grading of computer storage operating condition
An apparatus, system, and method are disclosed for rapidly grading the operating condition of computer storage. A storage log module 312 logs error information regarding any error in a storage...
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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...
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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....
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8116025 |
Disk drive executing retry operation after adjusting jog value in response to gain control
A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors. A head is actuated radially over the disk for generating a read...
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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...
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8107180 |
Hard-disk drive and control method for magnetic recording on a patterned medium of the hard-disk drive
A hard-disk drive. The hard-disk drive includes a magnetic-recording disk including tracks on which a plurality of patterned bit-cells that are isolated magnetically are aligned at predetermined...
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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...
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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...
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8098447 |
Method and apparatus to limit DC-level in coded data
In a perpendicular magnetic recording system, the data that is being written by the write channel is fed back into the read channel. The read channel processes the data and decides if the written...
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8094401 |
Writing high frequency pattern over a DC background to detect skip track erasure for a disk drive
A method of detecting skip track erasure for a head and disk of a disk drive is disclosed. N tracks are DC erased, and a periodic pattern is written to the disk at a target track within the DC...
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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...
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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...
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8089715 |
Split sector formatting of storage disks
Formatting a storage disk is disclosed. A first portion of a sector of the storage disk is defined. The first portion precedes a defect and has a first length that varies based on a detected...
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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...
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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 v...
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8085038 |
Method for testing noise of thin-film magnetic head, and magnetic disk drive apparatus with noise testing function
A noise-testing method for a thin-film magnetic head with an MR read head element and a heating unit capable of applying a heat and a stress to the MR read head element, includes a step of applying...
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8078421 |
Multi-cell disk drive test system providing a power recovery mode
A multi-cell disk drive test system that provides a power recovery mode is disclosed. The multi-cell disk drive test system includes a test platform having a plurality of cells configured to...
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8077414 |
System and method for analyzing magnetic media surfaces for thermal erasures and other characteristics
Analyzing magnetic media surfaces for thermal erasures and other characteristics is described. The system includes a drive channel module configured to measure servo automatic gain control values...
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8077415 |
Preamp circuit including a loopback mode for data storage devices
A data storage device preamplifier circuit including (i) a write amplifier having an input and an output, and (ii) a read amplifier has an input and an output. The data storage device preamplifier...
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8077426 |
Magnetic disk centering method and system
A system and method are described for aligning a data axis of one or more circular data-bearing tracks on an annular surface region of a magnetic media-bearing disk, with a spin axis of a spindle...
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