Head instability recovery method for a disk drive
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United States of America Patent
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Aug 17, 1999
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N/A
app pub date -
Feb 8, 1994
filing date -
Feb 8, 1994
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Abstract
A method of recovering a read/write head in a metastable state employs a retry algorithm which uses a combinatorial approach, i.e., parameters are altered step-by-step, and the retry algorithm is operational for a predetermined time. The method also employs an auxiliary write operation that utilizes a predetermined spare data sector on a track, another sector of which includes data. In this spare data sector, the corrective write/cycling operation can occur without requiring any seek operations and without overwriting of prerecorded data. In addition, the present method may include the step of moving the arm on which the head is mounted to a remote or crash position relative to a magnetic medium such as a disk, and, if so chosen, forcing a write operation with the head in that position.
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