Tracking in hard disk drive using magnetoresistive heads
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United States of America Patent
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Jun 23, 1998
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app pub date -
Jul 18, 1996
filing date -
Jul 18, 1996
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Abstract
An asymmetric quadrature-providing servo burst format for a tracking servo within a hard disk drive is particularly well suited for MR heads. The four-burst format may be written onto the disk with only two servo-writer passes per track by using an alternating one-third, two-thirds track pitch regimen. During operation of a drive incorporating the servo format of the present invention, the servo system uses an appropriate combination of bursts and burst sums, based on burst amplitude profiles, in order to achieve optimized position error signal (PES) continuity and linearity as the head moves off of nominal track centerline of each concentric data track.
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