Disk drive with variable incremented counting of writes to the data tracks for minimizing the effect of far track erasure
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United States of America Patent
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Sep 10, 2013
Grant Date -
Jan 19, 2012
app pub date -
Jul 19, 2010
filing date -
Jul 19, 2010
priority date (Note) -
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Abstract
A hard disk drive (HDD) minimizes the effects of far track erasure (FTE) by counting the number of writes to the data tracks and incrementing counters based on the known effect of FTE on each track. The extent of the FTE effect is determined for each track within a range of tracks of the track being written, and based on the relative FTE effect for all the tracks in the range a count increment (CI) is determined for each track within the range. A counter is maintained for each track. For every writing to a track, a count for each track within a range of the track being written is increased by the CI value associated with the track number within the range. When the count value for a track reaches a predetermined threshold the data is read from that track and rewritten, preferably to the same track.
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