David G Sutton

US Patent:

44245432, Jan 3, 1984

Filed:

Nov 16, 1981

Appl. No.:

6/321747

Inventors:

Martyn A. Lewis - Pacific Palisades CA
Steven K. Penniman - Goleta CA
David A. Sutton - Santa Ynez CA

Assignee:

DMA Systems Corporation - Goleta CA

International Classification:

G11B 582
G11B 2110
G11B 2108

US Classification:

360135

Abstract:

In a magnetic disc storage system and a magnetic disc therefor, the disc having opposed surfaces, at least one of the surfaces being coated with a magnetic material, the disc being adapted to be mounted on a spindle for rotation relative to a magnetic transducer positioned for recording data on and retrieving data from the disc, a plurality of concentric annular tracks being defined on the surface of the disc, each of the tracks being divided into a plurality of sectors, each sector having associated therewith prerecorded servo data for identification thereof, the improvement wherein the servo data for each sector comprises a unit distance track identification code recorded three times in succession, the code changing between adjacent sectors of adjacent tracks, and a clock shift check code recorded immediately following the last recorded one of the track identification codes, the same clock shift check code being recorded for each sector of every track.