Method for operating disk drive having improved timing marks

Details Method for operating disk drive having improved timing marks Method for operating disk drive having improved timing marks

2007-06-05

2007-06-05

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Address coding

C360S051000

Reexamination Certificate

active

10676632

ABSTRACT:
A method for operating a disk drive having 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: 7042666 (2006-05-01), Blaum et al.

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