Method for servo defect management of a magnetic disk in hard di

Details Method for servo defect management of a magnetic disk in hard di Method for servo defect management of a magnetic disk in hard di

1996-04-05

1998-08-25

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 53, 360 75, 360 7814, 369 58, G11B 2736

Patent

active

057988838

ABSTRACT:
A method for controlling a servo system of a hard disk drive of the present invention contemplates reading a servo defect list from a hard disk drive; performing a track seek order on a disk; ascertaining whether a corresponding servo is in the servo defect list; ignoring position information of the corresponding servo, when the corresponding servo is in the servo defect list; estimating position information of a track from position information of a servo immediately preceding the corresponding servo after ignoring the position information of the corresponding servo; performing a predetermined servo control algorithm after estimating the position information of the corresponding servo based on the position information of the servo immediately preceding the corresponding servo; and performing the servo control algorithm after reading out position information from the corresponding servo, when the corresponding servo is not in the servo defect list. According to the present invention, normal position information is used instead of the position information of the corresponding servo in the servo defect list during the operation of the hard disk drive, so that the disturbance is prevented from acting as input data of the servo system and thus the system is stably operated.

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