Self-servowriting timing pattern generation

Details Self-servowriting timing pattern generation Self-servowriting timing pattern generation

G - Physics

11

B

G11B 5/455 (2006.01) G11B 5/02 (2006.01) G11B 5/55 (2006.01) G11B 5/596 (2006.01) G11B 21/10 (2006.01)

Patent

CA 2163053

Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment andnon-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns aredetected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.

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