Disk drive having improved timing marks

Details Disk drive having improved timing marks Disk drive having improved timing marks

2006-05-09

2006-05-09

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

C360S040000, C360S053000, C360S048000, C360S077020, C369S047210, C369S047220

Reexamination Certificate

active

07042666

ABSTRACT:
A disk drive has timing marks (TMs) on the disk, that are chosen to reduce the probability of misidentification of a TM in the presence of read errors. The disk drive searches for TMs within a fixed TM search window which extends past the TM on the disk. A TM preferably maximizes the post-shift sliding distance for m post-shifts of the TM pattern, where m corresponds to the TM search window boundary. In this manner, the probability of a misidentification of the TM due to a post-shift having a small distance from the TM pattern is reduced. The TM pattern also provides pre-shift error resistance.

REFERENCES:
patent: 4914535 (1990-04-01), Weng
patent: 5903410 (1999-05-01), Blaum et al.
patent: 5999110 (1999-12-01), Blaum et al.
patent: 6288861 (2001-09-01), Blaum et al.
patent: 6411452 (2002-06-01), Cloke
patent: 6463564 (2002-10-01), Weng
patent: 6735031 (2004-05-01), Chainer et al.

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