Method and disk drive for enhanced performance in the presence of stationary PES outliers
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United States of America Patent
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-
Mar 2, 2004
Grant Date -
Dec 19, 2002
app pub date -
Jun 4, 2001
filing date -
Jun 4, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are provided for enhanced performance in the presence of stationary position error signal (PES) outliers in a direct access storage device (DASD). A plurality of PES samples are obtained from a plurality of servo sectors around a track. Utilizing the PES samples, a normalized outlier value is computed for each of the plurality of servo sectors around the track. The computed normalized outlier values are sequentially stored and compared with a set threshold value. A stationary PES outlier is identified responsive to each stored outlier value being greater than the set threshold value. Each identified stationary PES outlier is utilized during predefined operations of the DASD. During a recalibration mode of the DASD, a different track for feedforward generation is selected to avoid an identified stationary PES outlier. When more than one stationary PES outlier is identified from the servo sectors around a track, then data from the track is reassigned to an alternate track and the flawed track is marked to avoid use for future data storage.
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