Disk drive excluding servo sub-bursts when computing position error signal
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United States of America Patent
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Mar 1, 2011
Grant Date -
N/A
app pub date -
Oct 21, 2009
filing date -
Oct 21, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A disk drive is disclosed comprising a head actuated over a disk, the disk including a plurality of servo sectors wherein each servo sector comprises at least one servo burst. A read signal emanating from the head is sampled while reading a servo burst in a servo sector to generate a plurality of sample values. A quality metric is generated in response to a plurality of sample values of a servo sub-burst representing part of the servo burst. When the quality metric does not exceed a threshold, the servo sub-burst sample values are excluded when generating a position error signal (PES) representing a position of the head over the disk. When the quality metric exceeds the threshold, the servo sub-burst sample values are included when generating the PES. The head is then positioned over the disk in response to the PES.
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