Characterizing head parameters of a disk drive by evaluating track profile of an overwritten track
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United States of America Patent
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May 6, 2014
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N/A
app pub date -
Feb 29, 2012
filing date -
Feb 29, 2012
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Abstract
A disk drive is disclosed comprising a disk comprising a plurality of tracks, and a head actuated over the disk. The head is positioned over a track while writing a first frequency pattern substantially centered on the track at a first frequency. After writing the first frequency pattern, a second frequency pattern is written substantially centered on the track at a second frequency, wherein the second frequency pattern is written over the first frequency pattern. After writing the second frequency pattern over the first frequency pattern, the head is scanned across the track while reading the disk to generate a read signal. A first frequency component is extracted from the read signal representing the first frequency.
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