Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1990-01-17
1993-05-11
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 7708, 360 48, 369 47, G11B 5012
Patent
active
052106608
ABSTRACT:
A data recording apparatus, such as a disk drive or tape drive 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 mark or 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.
REFERENCES:
patent: 4016603 (1977-04-01), Ottesen
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4630140 (1986-12-01), Sugimura et al.
patent: 4823212 (1989-04-01), Knowles et al.
patent: 4841498 (1989-06-01), Sugimura et al.
patent: 4933786 (1990-06-01), Wilson
"Servo Zones Embedded In Data Tracks Solve Old, But Create New Problems." Brett Smith, Spring 1988, pp. 45, 46 and 48.
Berthold Thomas R.
Edun Muhammad
International Business Machines - Corporation
Otto, Jr. Henry E.
Psitos Aristotelis
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