Magnetic disk system having tracking control using recorded info

Details Magnetic disk system having tracking control using recorded info Magnetic disk system having tracking control using recorded info

1991-05-06

1991-12-03

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, G11B 5596

Patent

active

050704214

ABSTRACT:
A magnetic disk system comprises: a magnetic disk in which servo information is stored deeply in the appropriate fields Es longitudinally separated from the data field ED into which information of each track is stored; a subhead provided at a position ahead of the main head in a direction of data writing through the main head, the subhead being in a unitary construction with the main head and having a wider gap than the main head; a tracking control means for controlling the position of the main head relative to the desired track on the basis of the servo information SD that is read by means of the subhead for erasing information at the data field ED by means of the subhead prior to data writing by the main head in the data field ED; and a switch means for shifting the switch to tracking control means or to information erasing means.

REFERENCES:
patent: 3404392 (1968-10-01), Sordello
patent: 3614756 (1971-10-01), McIntosh et al.
patent: 4110799 (1978-08-01), Bergmans et al.
patent: 4286296 (1981-08-01), Cunningham
patent: 4313140 (1982-01-01), Keidl
patent: 4318141 (1982-03-01), Haynes
patent: 4390911 (1983-06-01), Klaassen
patent: 4547817 (1985-10-01), Klaassen
patent: 4581663 (1986-04-01), Tanaka
patent: 4652945 (1987-03-01), Marchant
IBM-Technical Disclosure Bulletin, vol. 16, No. 6, Nov. 1973, Servo Disk with Overlapping Servo and Data Tracks, Comstock et al., p. 1818.

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