Methods for conditional servowriting

Details Methods for conditional servowriting Methods for conditional servowriting

2007-06-05

2007-06-05

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S060000, C360S031000

Reexamination Certificate

active

10819089

ABSTRACT:
To account for head misplacement while servowriting, conditional writing and/or trimming of servo information can be used. Conditional servowriting allows servowriting to be disabled when it is determined that servo information will not be written and/or trimmed at a desired location or within a threshold distance of a desired location. For example, if a distance between a write element or a predicted location of servo information and a desired location of the servo information or write element exceeds a threshold, writing and/or trimming can be inhibited. Servowriting can be resumed when it is determined that servo information will be written or trimmed at a desired location or within a threshold distance of a desired location. A servowriting step or pass is not re-started when the threshold is exceeded and those wedges for which servo information was not written and/or trimmed can be attempted during subsequent revolutions of the rotatable storage medium.

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“Minimizing Effects of Vibration at Servowrite”, Sep. 1988; IBM Technical Disclosure bulletin; pp. 129-130.

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