Disk drive mapping out data tracks to avoid thermal asperities
AssigneeWestern Digital Technologies, Inc.
InventorGomez Sam Vasanthan Selvaraj
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Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks, wherein the head comprises a write element and a read element. An asperity in a target data track is detected, and a range of data tracks proximate the target data track is mapped out, wherein the range of data tracks spans at least twice a radial offset between the read element and the write element at the radial location of the target data track.
Claims22
A disk drive comprising:
- a disk comprising a plurality of data tracks;
- a head actuated over the disk, wherein the head comprises a write element and a read element;
- and
- control circuitry operable to:
- detect an asperity in a target data track;
- and
- map out a range of data tracks proximate the target data track, wherein the range of data tracks spans at least twice a radial offset between the read element and the write element at the radial location of the target data track.
A disk drive comprising:
- a disk comprising a plurality of data tracks;
- a head actuated over the disk, wherein the head comprises a write element and a read element;
- and
- control circuitry operable to:
- generate a long seek distance corresponding to when a radial offset between the read element and the write element is near a minimum;
- seek the head radially over the disk in response to a command seek distance;
- and
- when the command seek distance is greater than the long seek distance, increase a fly height of the head during the seek.
A method of operating a disk drive, the disk drive comprising a head actuated over a disk comprising a plurality of data tracks, wherein the head comprises a write element and a read element, the method comprising:
- detecting an asperity in a target data track;
- and
- mapping out a range of data tracks proximate the target data track, wherein the range of data tracks spans at least twice a radial offset between the read element and the write element at the radial location of the target data track.
A method of operating a disk drive, the disk drive comprising a head actuated over a disk comprising a plurality of data tracks, wherein the head comprises a write element and a read element, the method comprising:
- generating a long seek distance corresponding to when a radial offset between the read element and the write element is near a minimum;
- seeking the head radially over the disk in response to a command seek distance;
- and
- when the command seek distance is greater than the long seek distance, increasing a fly height of the head during the seek.
Dependencies are inferred from the claim text.