Patent
Self-writing of servo patterns in disk drives
Patrick Moran,Tim Everett,Peter McEwen,Mike Moser,Stan Shepherd,Eduardo Veiga,Murat Erkocevic,Bill R. Baker +7 more
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TLDR
In this paper, the authors present a self-servo writing system for a disk drive by transferring a servo reference pattern by magnetic printing onto at least one storage surface of a reference disk, wherein a resulting printed reference pattern includes embedded servo information providing servo timing and transducer head position information.Abstract:
A method and system for self-servo writing a disk drive by transferring a servo reference pattern by magnetic printing onto at least one storage surface of a reference disk, wherein a resulting printed reference pattern includes embedded servo information providing servo timing and transducer head position information; assembling the disk drive including the steps of installing at least said disk into the disk drive and enclosing said disk and the data transducers within a housing sealed against particulate contamination from an eternal ambient environment; reading the printed reference pattern from said disk via at least one transducer head to generate a readback signal; sampling the readback signal at a sampling rate to generate a sampled signal; processing the sampled signal waveform specturm to generate a recovered signal including the embedded servo information and a fundamental frequency of the sampled signal; using the servo information from the recovered signal to precisely position and maintain the data transducers at concentric track locations of disk storage surfaces; and self-writing disk drive servo patterns onto the storage surfaces at the concentric track locations with the data transducers in accordance with disk drive servo pattern features.read more
Citations
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Patent
Servo writing a disk drive by synchronizing a servo write clock to a high frequency signal in a spiral track
TL;DR: In this paper, a method of writing product servo sectors to a disk of a disk drive is described, where a plurality of spiral tracks are written to the disk, wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark.
Patent
Servo writing a disk drive from spiral tracks by generating a time-stamped sync mark detect signal processed by timing recovery firmware
TL;DR: In this article, a disk drive is used to write a servo written from spiral tracks by generating a time-stamped sync mark detect signal processed by timing recovery firmware, where a plurality of spiral tracks are written to the disk, wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark.
Patent
Determining repeatable runout cancellation information using PES information generated during self servo-writing operations
Robert J. McNab,Hemant Melkote +1 more
TL;DR: In this paper, the authors proposed a method for generating a repeatable runout (RRO) compensation value set for a circular track on a magnetic medium on a surface of a disk in a disk drive.
Patent
Adjusting track density over disk radius by changing slope of spiral tracks used to servo write a disk drive
TL;DR: In this article, a method and apparatus for adjusting the track density over the disk radius by changing the slope of spiral tracks used to servo write a disk drive is described, where a plurality of tracks are written to the disk wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark.
Patent
Adjusting track density by changing PES algorithm when servo writing a disk drive from spiral tracks
TL;DR: In this article, a method and apparatus for writing product servo sectors to a disk of a disk drive to define a plurality of data tracks is described, where the disk drive comprises the disk and a head actuated over the disk.
References
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Patent
Radial self-propagation pattern generation for disk file servowriting
TL;DR: In this paper, a mechanism for servowriting on a storage medium of a storage device has been proposed, where at least one transition is written on a track of the storage medium, while servoing on other transitions previously recorded on the track, and a reference waveform is derived as a function of a closed loop response of the servo loop and a position error waveform.
Patent
System for self-servowriting a disk drive
TL;DR: In this paper, a servowriter capable of non-invasively servowriting a magnetic recording disk drive controls the drive's on-board electro-mechanical head-position actuator system and read/write interface to self-servowrite the target drive.
Patent
Master information carrier, process for producing the carrier, and method and apparatus for recording master information signal on magnetic recording medium by using the carrier
TL;DR: In this article, a method for writing an information signal into a sheet or disk magnetic record medium with a ferromagnetic thin film or coating is performed by putting the surface of the magnetized record medium into contact with the master information carrier, so as to write a magnetized pattern corresponding to the embossed pattern of the master Information carrier into the magnetic Record medium.
Patent
Video file server using an integrated cached disk array and stream server computers
Percy Tzelnic,Uresh K. Vahalia,Dennis Ting,Lev Vaitzblit,Wayne W. Duso,Kannan M Alagappan,John Forecast +6 more
TL;DR: In this paper, a video file server includes an integrated cached disk array storage subsystem and a plurality of stream server computers linking the cached disk storage system to the data network for the transfer of video data streams.
Patent
Self-writing of servo patterns based on printed reference pattern in rotating disk drive
TL;DR: In this article, a coarse magnetic template pattern is transferred to a data storage surface of a disk by magnetic printing techniques and the disk is then assembled into a completed and enclosed disk drive.