Disk drive for writing micro-jog values along the centerline of a reserved track and for writing user data offset from the centerline of a data track
AssigneeWestern Digital Technologies, Inc.
InventorYoo H. Kim
Life of this patent
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Abstract
The present invention may be regarded as a disk drive comprising a disk having a plurality of data tracks and at least one reserved track. At least one of the data tracks for recording user data along a circumferential path offset from the centerline of the data track, and the at least one reserved track for recording data track micro-jog values along a circumferential path substantially aligned with the centerline of the reserved track.
Claims4
In a disk drive comprising a disk having a plurality of data tracks and at least one reserved track, and a head comprising a read element offset from a write element, a method of recording data track micro-jog values in the reserved track, the method comprising the steps of:
- (a) calibrating a reserved track micro-jog value;
- (b) seeking the head to the reserved track;
- (c) using the reserved track micro-jog value to maintain the read element offset from a centerline of a read track in order to maintain the write element over a centerline of the reserved track;
- and
- (d) writing the data track micro-jog values to the reserved track substantially along the centerline of the reserved track.
In a disk drive comprising a disk having a plurality of data tracks and at least one reserved track, and a head comprising a read element offset from a write element, a method of reading data track micro-jog values recorded in the reserved track, the data track micro-jog values used to compensate for the offset between the read element and the write element, the method comprising the steps of:
- (a) seeking the head to the reserved track;
- (b) maintaining the read element over a centerline of the reserved track;
- (c) reading the data track micro-jog values recorded in the reserved track;
- (d) storing the data track micro-jog values in a semiconductor memory;
- and
- (a) seeking the head to a selected one of the data tracks;
- (b) maintaining the read element over a centerline of a read track to maintain the write element offset from a centerline of the selected data track;
- and
- (c) writing user data to the selected data track.
Dependencies are inferred from the claim text.