Systems and methods for self-servowriting with improved...

Details Systems and methods for self-servowriting with improved... Systems and methods for self-servowriting with improved...

2006-08-29

2006-08-29

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07099108

ABSTRACT:
The initial attempt to servowrite a wedge in the final pattern may fail due to disk defects and a retry of servowriting the failed wedge is usually attempted. The current invention shifts the position of the final wedge during at least one such servowriting retry attempt. Since a final wedge position different from a previous self servowriting attempt is adopted, potential defects on the surface of the media can possibly be avoided and the success rate of the servowriting retry attempt can be improved. In practice, this involves carrying a count of failed wedges during the servowrite process and if it exceeds a threshold level, then the wedge pattern is shifted in position and the servowrite process starts again. This can be repeated for many shift positions. 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: 6304407 (2001-10-01), Baker et al.
patent: 6519107 (2003-02-01), Ehrlich et al.
patent: 6704156 (2004-03-01), Baker et al.
patent: 6885513 (2005-04-01), Baker

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