Magnetic storage systems and methods allowing for recovery of data blocks written off-track with non-constant offsets
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United States of America Patent
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Apr 21, 2009
Grant Date -
N/A
app pub date -
Apr 12, 2005
filing date -
Nov 3, 2004
priority date (Note) -
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Abstract
A magnetic storage system includes a disk, a head, an actuator, a read channel, and a main controller. The main controller causes the head to read a data block of a selected track of the disk at each of a plurality of fixed offsets from a center of the selected track. The main controller samples a gain in the read channel a plurality of times while the head is reading the data block at each of the plurality of fixed offsets to obtain a plurality of gain samples for each of the plurality of fixed offsets. If the data block was written off-track with a non-constant offset, the main controller determines an approximate starting position and an approximate rate of change of an off-track deviation of the data block based on the plurality of gain samples for the plurality of fixed offsets.
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