Disk drive detecting defective spiral servo track

Details Disk drive detecting defective spiral servo track Disk drive detecting defective spiral servo track

2009-02-13

2010-06-29

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000, C360S077070

Reexamination Certificate

active

07746592

ABSTRACT:
A disk drive is disclosed comprising a disk and a head actuated over the disk, wherein the disk comprises a plurality of spiral tracks, each comprising a high frequency signal interrupted by a sync mark at a sync mark interval. The head is used to read a spiral track to generate a spiral track crossing signal g(xn), where xnis a time in a demodulation window. A position error signal (PES) is determined in response to g(xn), and a deviation index is computed by correlating g(xn) with a nominal track crossing signal shifted by the PES. When the deviation index is less than a threshold, the PES is used to servo the head over the disk.

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