Systems and methods for repairable servo burst patterns

Details Systems and methods for repairable servo burst patterns Systems and methods for repairable servo burst patterns

2007-08-28

2007-08-28

Korzuch, William (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000, C360S077040, C360S077080

Reexamination Certificate

active

10923662

ABSTRACT:
The misplacement of a servo burst during a servowriting or self-servowriting process can be corrected by erasing and re-writing that burst. A servo pattern can be selected that has sufficient radial separation between bursts such that if a burst is re-written and trimmed there should be no damage to adjacent bursts. The radial separation can be selected to be greater than the width of the appropriate write element in order to allow for some misplacement of the element during the erasing and/or re-writing of the misplaced burst. Alternatively, a batch writing approach can be used to minimize the time needed to re-write misplaced bursts. In addition, WORF information of a track can be saved in memory for future servowriting and/or can be utilized to calculate a threshold for identifying servo bursts to be repaired. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures, and the claims.

REFERENCES:
patent: 5381281 (1995-01-01), Shrinkle et al.
patent: 6476989 (2002-11-01), Chainer et al.
patent: 2004/0061968 (2004-04-01), Fukushima et al.

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