Patent ID: 6021012
Filing Date: 2000-02-01
Classification: G11B

Abstract:
An automatic servo address mark detecting and servo timing compensating circuit of a disk drive including a controller which stores and outputs initial values for detecting servo and data information in synchronization with a point of servo address mark detection, said circuit comprising:a servo address mark detection window generating unit for generating a servo address mark detection missing signal and a 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 a pseudo servo address mark signal when a servo address mark detection missing signal count corresponds to data loaded from said controller;a servo address mark search mode controller for selecting one of the servo address mark search signal and the pseudo servo address mark signal in response to a select signal loaded from said controller; anda servo timing compensation unit for counting system clocks, starting from the data loaded from said controller, and compensating for a delay of servo timing in response to the count control signal.