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公开(公告)号：JPS61214207A
公开(公告)日：1986-09-24
申请号：JP28321185
申请日：1985-12-18
Applicant: IBM
Inventor： JEN SHEN , KABELAC WILLIAM J , SANDERS IAN L
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公开(公告)号：CA2134014A1
公开(公告)日：1995-06-24
申请号：CA2134014
申请日：1994-10-21
Applicant: IBM
Inventor： HETZLER STEVEN R , KABELAC WILLIAM J
IPC: G11B5/55 , G11B5/56 , G11B5/596 , G11B19/12 , G11B20/10 , G11B20/12 , G11B20/18 , G11B21/08 , G11B21/10 , G11B27/30
Abstract: A sector servo, zone bit recording disk drive includes a sector architecture in which the recording head locates and identifies data sectors without using data ID fields, but instead using information obtained from electronic storage and from servo sectors which need not be adjacent to the data sectors. The tracks contain servo information and data, but not data sector ID information. The tracks in each zone are circumferentially divided into segments. Included in each segment is a number of data regions separated from one another by servo sectors. The data regions may contain partial data sectors and complete data sectors. The format information provided to identify and locate data sectors, including ones whose region locations are not adjacent to servo sectors, includes an entry for each region in the section. Each entry includes the lengths of the first and last data sections in the region, whether the sectors represented by those sections are split between two regions, the total number of data sectors in the region, and the sector number of the first data sector in the region. The information provided in the servo sectors consists of a servo sector number or other indicia which enables the disk drive to determine the position of the recording head and begin reading or writing immediately upon settling on-track and without incurring a latency penalty.
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Patent Agency Ranking
公开(公告)号：BR9405156A
公开(公告)日：1995-10-17
申请号：BR9405156
申请日：1994-12-20
Applicant: IBM
Inventor： HETZLER STEVEN R , KABELAC WILLIAM J
IPC: G11B5/55 , G11B5/56 , G11B5/596 , G11B19/12 , G11B20/10 , G11B20/12 , G11B20/18 , G11B21/08 , G11B21/10 , G11B27/30 , G11B19/20 , G06K19/00
Abstract: A sector servo, zone bit recording disk drive includes a sector architecture in which the recording head locates and identifies data sectors without using data ID fields, but instead using information obtained from electronic storage and from servo sectors which need not be adjacent to the data sectors. The tracks contain servo information and data, but not data sector ID information. The tracks in each zone are circumferentially divided into segments. Included in each segment is a number of data regions separated from one another by servo sectors. The data regions may contain partial data sectors and complete data sectors. The format information provided to identify and locate data sectors, including ones whose region locations are not adjacent to servo sectors, includes an entry for each region in the section. Each entry includes the lengths of the first and last data sections in the region, whether the sectors represented by those sections are split between two regions, the total number of data sectors in the region, and the sector number of the first data sector in the region. The information provided in the servo sectors consists of a servo sector number or other indicia which enables the disk drive to determine the position of the recording head and begin reading or writing immediately upon settling on-track and without incurring a latency penalty.
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公开(公告)号：CA2030872C
公开(公告)日：1995-05-16
申请号：CA2030872
申请日：1990-11-26
Applicant: IBM
Inventor： BEST JOHN S , HETZLER STEVEN R , KABELAC WILLIAM J , THOMPSON DAVID A
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 resynchronization 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 synchronization 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：BR9100033A
公开(公告)日：1991-10-22
申请号：BR9100033
申请日：1991-01-07
Applicant: IBM
Inventor： BEST HOHN S , HETZLER STEVEN ROBERT , KABELAC WILLIAM J , THOMPSON DAVID A
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：CA1233247A
公开(公告)日：1988-02-23
申请号：CA506445
申请日：1986-04-11
Applicant: IBM
Inventor： JEN SHEN , KABELAC WILLIAM J
Abstract: An improved servo control system for data track following of the read/write head in a magnetic recording system uses a pattern of segments of servo information slanted across the data tracks. The time of flight of the servo segment from occurrence of a reference pulse until the peak servo signal is read by the head is an indication of the position of the head in a direction perpendicular to the desired track. This time is compared with the known time of flight if the head were precisely over the centerline of the desired track and the time difference is used to generate a control signal to position the head over the track centerline. In an embodiment where each segment is slanted across only one track, the reference pulse is the beginning of the servo signal and the time measurement is the number of fixed frequency magnetic transitions read by the head in the servo segment. When the system is used in flexible disk drives, the servo segments are written in one of the data sectors on the flexible disk by the user's disk drive.
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公开(公告)号：CA1220270A
公开(公告)日：1987-04-07
申请号：CA499459
申请日：1986-01-13
Applicant: IBM
Inventor： JEN SHEN , KABELAC WILLIAM J , SANDERS IAN L
IPC: G11B15/087
Abstract: An improved magnetic recording disk drive, in particular a flexible disk drive, includes a head positioning servo system which utilizes servo information recorded on the disk by the disk drive. The servo information is located within one of the data sectors and is in the form of a pattern of radially spacedapart segments, each segment overlapping a number of data tracks and comprising magnetic transitions which increase in frequency in the radial direction to provide a digital head position error signal (PES). A similar segment is located in each of the other data sectors around the perimeter of the disk to provide track profile information so that the head positioning system can compensate for disk runout and distortion. The disk drive includes means for eliminating the effect of the amplitude of the readback signal from the servo and profile segments on the head positioning system, thus assuring a reliable PES at all radial locations on the disk and allowing interchangeability of disks among disk drives.
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