Servo protection circuit for disk drive

Details Servo protection circuit for disk drive Servo protection circuit for disk drive

1988-07-18

1989-06-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360 7707, G11B 1504, G11B 2110

Patent

active

048413844

ABSTRACT:
A servo protection circuit comprises a sync detector for generating a sync pulse in response to a sync code prerecorded in each sector of a magnetic disk to permit synchronism to be reestablished between the disk and the servo protect pulse at the beginning of each sector. In response to the sync pulse, a servo protect pulse is generated having a duration variable with the interval between successive ones of the sync pulse so that servo protection begins and ends with the beginning and ending points of each prerecorded servocontrol field. The servo protection circuit includes a delay circuit for introducing a shorter delay time of constant duration to the sync pulse to determine the trailing edge of the servo protect pulse and introducing a longer delay time of constant duration to the sync pulse to determine the leading edge of the servo protect pulse.

REFERENCES:
patent: 4688112 (1987-08-01), Shoji et al.

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