Method and apparatus for determining systematic errors

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking

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360 75, 360 7708, 360 76, G11B 509

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059010037

ABSTRACT:
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 and non-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 are detected 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.

REFERENCES:
patent: 5229901 (1993-07-01), Mallary
patent: 5416652 (1995-05-01), Lewis
patent: 5485322 (1996-01-01), Chainer et al.
patent: 5570247 (1996-10-01), Brown et al.
patent: 5581420 (1996-12-01), Chainer et al.
patent: 5615058 (1997-03-01), Chainer et al.
"Regenerative Clock Technique For Servo Track Writers," IBM Technical Disclosure Bulletin, vol. 33 No. 5, pp. 310-311 (Oct. 1990).

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