公开(公告)号：SG45331A1

公开(公告)日：1998-01-16

申请号：SG1996003611

申请日：1991-01-17

Applicant: IBM

Inventor： HETZLER STEVEN ROBERT

IPC: G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B21/10 ,  G11B27/30 ,  G11B5/596

Abstract: A method and means is described wherein servo sectors written on a disk (or servo sections written on a tape) are equally spaced on a given track and read during seek, settle and track following operations. An algorithm is used to determine the allowable time separation between servo sectors (or sections) on a track and lengths of associated data sections, such as data sectors or variable length records, that may be accommodated on the disk or tape in such manner that each of the servo sectors (or sections) equally spaced on a given track is located within a data field of a data sector or within an identification region or immediately after an address indicating mark (such as address marker index mark). The rate at which the servo sector (or section) is sampled is constant and independent of the number and lengths of the data sections. As a result of this independent relationship, this technique is suitable for CLD recording, to banded disks using sectored servo as in conventional FBA, and also even to non-sectored architectures, such as count-key-data (CKD), wherein the data is written in records of variable length, and to tape drives formatted in FBA or CKD.

公开(公告)号：SG44407A1

公开(公告)日：1997-12-19

申请号：SG1996000204

申请日：1993-03-17

Applicant: IBM

Inventor： HETZLER STEVEN ROBERT

IPC: G11B5/09 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B21/08 ,  G11B21/10 ,  G11B27/10 ,  G11B27/30 ,  H03M13/35

Abstract: A data recording disk file is provided with fixed block address head positioning information that is readable off-track with no increase in error rate. The positioning information includes both identification information 304 to provide radial and/or circumferential orientation for the recording head, and error handling information 305 to ensure that the id information is properly read. Either or both of the id information and the error handling information A, B, C for adjacent tracks are placed on the data storage disk at circumferentially offset positions to eliminate adjacent track interference, and at radially overlapped positions extending into the adjacent tracks to provide full readability when the head is off-track.

公开(公告)号：DE69118213T2

公开(公告)日：1996-10-10

申请号：DE69118213

申请日：1991-01-17

Applicant: IBM

Inventor： HETZLER STEVEN ROBERT

IPC: G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B21/10 ,  G11B27/30

Abstract: A method and means is described wherein servo sectors written on a disk (or servo sections written on a tape) are equally spaced on a given track and read during seek, settle and track following operations. An algorithm is used to determine the allowable time separation between servo sectors (or sections) on a track and lengths of associated data sections, such as data sectors or variable length records, that may be accommodated on the disk or tape in such manner that each of the servo sectors (or sections) equally spaced on a given track is located within a data field of a data sector or within an identification region or immediately after an address indicating mark (such as address marker index mark). The rate at which the servo sector (or section) is sampled is constant and independent of the number and lengths of the data sections. As a result of this independent relationship, this technique is suitable for CLD recording, to banded disks using sectored servo as in conventional FBA, and also even to non-sectored architectures, such as count-key-data (CKD), wherein the data is written in records of variable length, and to tape drives formatted in FBA or CKD.

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

IPC: G11B5/584 ,  G11B5/596 ,  G11B20/12 ,  G11B21/10

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.