Apparatus for controlling reading and writing in a disk drive

Details Apparatus for controlling reading and writing in a disk drive Apparatus for controlling reading and writing in a disk drive

1993-05-05

1994-02-08

Shepperd, John

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 51, 360 7708, 369 47, G11B 509, G11B 5596, G11B 1552, G11B 2010, G11B 2722

Patent

active

052853276

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 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.

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Brett Smith, "Servo Zones Embedded in Data Tracks Solve Old, But Create New Problems", Spring 1988, pp. 45, 46, 48.

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