Method and apparatus for recording transducer positioning inform

Details Method and apparatus for recording transducer positioning inform Method and apparatus for recording transducer positioning inform

1981-11-16

1984-01-03

Kilgore, Robert Martin

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 77, 360 78, G11B 582, G11B 2110, G11B 2108

Patent

active

044245432

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.

REFERENCES:
patent: 3292168 (1966-12-01), Gray
patent: 3792454 (1974-02-01), Lipp
patent: 3864741 (1975-02-01), Schwarz
patent: 4027338 (1977-05-01), Kril
patent: 4068267 (1978-01-01), Inouye
patent: 4087843 (1978-05-01), Louis et al.
patent: 4101942 (1978-07-01), Jacques
patent: 4149200 (1979-04-01), Card
patent: 4238809 (1980-12-01), Fujiki et al.
patent: 4297734 (1981-10-01), Laishley
patent: 4297737 (1981-10-01), Andresen

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