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公开(公告)号：SG30328A1
公开(公告)日：1996-06-01
申请号：SG1995000171
申请日：1995-03-27
Applicant: IBM
Inventor： LEE CHIH-KUNG , HORNE DONALD EDWARD , BEST JOHN STEWART , HETZLER STEVEN ROBERT , MARRELLO VINCENT , CHIANG WEN-WEI
IPC: G11B21/02
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公开(公告)号：BR9502512A
公开(公告)日：1996-04-09
申请号：BR9502512
申请日：1995-05-23
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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公开(公告)号：RU2141691C1
公开(公告)日：1999-11-20
申请号：RU96124499
申请日：1995-05-18
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: FIELD: computer engineering. SUBSTANCE: servo recording system measures position of head drives and outputs reference synchronization signal using semiconductor lasers. Inner reference signals for detection of position are provided by reflecting diffraction gratings which are connected to head drive lever and sleeve of disk drive spindle. Optical detectors read differential alterations in diffraction patterns including sensitivity to frequency drift. Electronic decoders converts data from optical detectors into signals for changing servo drive position. Electronic control units excites linear drive motor in disk drive, which positions record converter into position which is required for storing servo information which is provided by generator of servo system pattern generator. Transparent windows which are provided in cover of jacket which holds head and disk provides possibility to make record in disk drive in assembled and pressurized state. EFFECT: elimination of intervention into design of disk drive, increased efficiency for high-density disk drives. 8 cl, 20 dwg
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公开(公告)号：CA2144403A1
公开(公告)日：1995-11-28
申请号：CA2144403
申请日：1995-03-10
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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公开(公告)号：DE69018382T2
公开(公告)日：1995-10-12
申请号：DE69018382
申请日：1990-11-07
Applicant: IBM
Inventor： BEST JOHN STEWART , WANG PO-KANG
Abstract: A method of positioning separate read and write heads in a disk file compensates for misalignment of the heads when reading and writing data on the disk. Two sets of servo information are generated for each track on the disk. These sets are radially displaced with respect to each other by a distance equal to the respective misalignments between the read and write heads at each respective track. One set is generated by the write head. The other set is generated by the write head while the read head is aligned with said one set. Thereafter, to write data on a selected track, the read head is first aligned with said one set of servo information and then data is written on said track with the write head. To read data on a selected track, the read head is aligned to said other set of servo information and then the data is read by said read head.
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Patent Agency Ranking
公开(公告)号：DE69108418D1
公开(公告)日：1995-05-04
申请号：DE69108418
申请日：1991-01-17
Applicant: IBM
Abstract: A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal increase in overhead (non-data) regions. The tracks on the medium are divided into a plurality of maxi sections, each of which contains all fields with servo and associated overhead information and also a data field. At least one micro servo section containing only a portion of said information is located within each data field. As each micro servo section passes by an associated recording head, writing and reading of data is temporarily interrupted, but resumed when the micro servo section moves beyond the head, in such manner as to require minimal resynchronisation of said data during reading. Using a phase continuous clock, data is written in both portions of a data field to either side of each micro servo section in one pass of the disk or tape relative to the head. The micro servo sections contain no timing reference address mark and require no data encoder/decoder flush or synchronisation byte to resume reading in the portion of the data field following each micro servo section.
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公开(公告)号：AU6812090A
公开(公告)日：1991-07-18
申请号：AU6812090
申请日：1990-12-17
Applicant: IBM
Abstract: A method and means is described for writing data on a recording medium, such as a disk or tape, containing servo samples in such manner that the number of servo samples is increased with a minimal increase in overhead (non-data) regions. The tracks on the medium are divided into a plurality of maxi sections, each of which contains all fields with servo and associated overhead information and also a data field. At least one micro servo section containing only a portion of said information is located within each data field. As each micro servo section passes by an associated recording head, writing and reading of data is temporarily interrupted, but resumed when the micro servo section moves beyond the head, in such manner as to require minimal resynchronisation of said data during reading. Using a phase continuous clock, data is written in both portions of a data field to either side of each micro servo section in one pass of the disk or tape relative to the head. The micro servo sections contain no timing reference address mark and require no data encoder/decoder flush or synchronisation byte to resume reading in the portion of the data field following each micro servo section.
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公开(公告)号：IN190181B
公开(公告)日：2003-06-28
申请号：IN363DE1995
申请日：1995-03-06
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
IPC: G06K19/00
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公开(公告)号：DE69229200D1
公开(公告)日：1999-06-24
申请号：DE69229200
申请日：1992-06-25
Applicant: IBM
Inventor： BEST JOHN STEWART , HETZLER STEVEN ROBERT
Abstract: A data recording disk file is provided with a fixed block architecture sector format that eliminates the ID region. The servo region contains sector identification information in the form of a start-of-track indicating mark recorded in a selected sector of each track and a start-of-sector indicating mark recorded in each sector. A full track number identifier is encoded in the position field within the servo region of each sector. A look-up table is built at format time to map bad sectors out of the disk file. The table contains entries for each cluster of contiguous bad sectors, and is searched at runtime to provide conversion of logical sector location identifiers to physical sector location identifiers.
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公开(公告)号：DE69505524D1
公开(公告)日：1998-11-26
申请号：DE69505524
申请日：1995-05-18
Applicant: IBM
Inventor： BEST JOHN STEWART , CHIANG WEN-WEI , HETZLER STEVEN ROBERT , HORNE DONALD EDWARD , LEE CHIH-KUNG , MARRELLO VINCENT
Abstract: A non-invasive servo-write system for use in a data recording disk drive. The system measures actuator position and generates a reference clock using semiconductor lasers. Internal position references are provided by reflective diffraction gratings affixed to the actuator arm and the spindle hub. Wavefront reconstruction optics correct for aberrations in the gratings. Optical sensors detect differential changes in the diffraction patterns created by the gratings, eliminating sensitivity to frequency drift. Decode electronics convert optical sensor data into an actuator position measurement. Control electronics drive the voice coil motor within the disk drive, which positions the write transducer to record servo information provided in a servo pattern generator. Transparent windows in the head-disk-assembly cover allow the servo-writer to write drives which are completely assembled and sealed.
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