Automatic servo address mark detection and servo timing compensa

Details Automatic servo address mark detection and servo timing compensa Automatic servo address mark detection and servo timing compensa

1997-06-27

2000-02-01

Faber, Alan

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 53, G11B 509

Patent

active

060210125

ABSTRACT:
An automatic servo address mark detecting and servo timing compensating circuit of a disk drive includes a servo address mark detection window generating unit for generating a servo address mark detection missing signal and count control signal where the servo address mark is not detected within a range of a servo address mark window of a predetermined servo sector; a servo address mark missing signal counter, which is reset according to a servo address mark detection signal, for generating a servo address mark search signal and pseudo servo address mark where a servo address mark detection missing signal count matches data loaded from the control unit; a servo address mark search controller for selecting the servo address mark search signal and pseudo servo address mark among multiple signals input by the servo address mark missing signal counter according to a select signal input by the control unit; and a servo timing compensation unit for counting system clocks, starting from the data loaded from the control unit and compensating for a delay of servo timing where the count control signal is input.

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