APPARATUS AND METHOD OF DETECTING A DEFECTIVE SECTOR IN A DISK DRIVE
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United States of America Patent
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Issued Date -
Oct 13, 2011
app pub date -
Apr 13, 2011
filing date -
Apr 13, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and apparatus to detect a defective sector include features of determining a first error value by counting the number of error symbols in first data read from a sector by using a head in an on-track state, and reading second data from the sector by off-tracking the head in a positive direction and third data from the sector by off-tracking the head in a negative direction in response to the first error value being equal to or greater than a first threshold value. Additionally, a second error value is determined based on the number of error symbols in the read second data and a third error value is determined based on the number of error symbols in the read third data. Accordingly, the sector is determined to have a defect by comparing an average of the second and third error values to a second threshold value.
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