Characterizing magnetic recording parameters of a disk drive by evaluating track profile of dual microtracks
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United States of America Patent
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Jan 7, 2014
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N/A
app pub date -
May 4, 2012
filing date -
May 4, 2012
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Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks. The head is positioned over a track minus a first delta and a first frequency pattern is written at a first frequency. The head is positioned over the track plus a second delta and a second frequency pattern is written at a second frequency different from the first frequency. After writing the first frequency pattern and second frequency pattern, a third frequency pattern is written substantially centered on the track at a third frequency. After writing the third 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, and a second frequency component is extracted from the read signal representing the second frequency.
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