Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1993-06-30
1995-07-18
Epps, Georgia Y.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7702, 360 7706, 360 7804, 360 381, G11B 5596
Patent
active
054347254
ABSTRACT:
A magnetic disc driving device is operated in such a manner that frequency signals recorded in an in-phase relation in servo regions of a magnetic disc of a sector servo system aligned in the radial direction of the disc are reproduced by a read pulse generating unit to produce read pulses. The read pulses are counted by a counter unit, a counting output of which is compared by a comparator to a predetermined value to detect, a dropout in servo patterns on the magnetic disc. Servo signals are produced by a controlling unit from the servo regions of sectors excluding defective sectors for which the counting outputs less than the predetermined value are produced, and a servo control operation is performed based on the resulting servo signals for achieving highly accurate control of the magnetic head position.
REFERENCES:
patent: 4423498 (1983-12-01), Kimura et al.
patent: 4642562 (1987-02-01), Collins et al.
patent: 4669004 (1987-05-01), Moon et al.
patent: 4742507 (1988-05-01), Kuroki et al.
patent: 5268803 (1993-12-01), Sugita et al.
Hirose Toshihiko
Muto Takayasu
Edun Muhammad N.
Epps Georgia Y.
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