Data storage device measuring radial offset between read element and write element
First Claim
1. A data storage device comprising:
- a disk comprising a plurality of tracks;
a head actuated over the disk, the head comprising a read element radially offset from a write element; and
control circuitry configured to;
write a first pattern to a single track;
read the first pattern from the single track to generate a first read signal;
generate a first quality metric based on the first read signal;
write a second pattern to the single track, wherein the second pattern is different from the first pattern;
read the second pattern from the single track to generate a second read signal;
generate a second quality metric based on the second read signal; and
measure the radial offset of the read element and write element based on the first and second quality metrics.
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Accused Products
Abstract
A data storage device is disclosed comprising a disk comprising a plurality of tracks and a head actuated over the disk, wherein the head comprises a read element radially offset from a write element. A first pattern is written to a single track, and the first pattern is read from the single track to generate a first read signal from which a first quality metric is generated. A second pattern is written to the single track, wherein the second pattern is different from the first pattern. The second pattern is read from the single track to generate a second read signal from which a second quality metric is generated. The radial offset of the read element and write element is measured based on the first and second quality metrics.
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Citations
29 Claims
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1. A data storage device comprising:
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a disk comprising a plurality of tracks; a head actuated over the disk, the head comprising a read element radially offset from a write element; and control circuitry configured to; write a first pattern to a single track; read the first pattern from the single track to generate a first read signal; generate a first quality metric based on the first read signal; write a second pattern to the single track, wherein the second pattern is different from the first pattern; read the second pattern from the single track to generate a second read signal; generate a second quality metric based on the second read signal; and measure the radial offset of the read element and write element based on the first and second quality metrics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A data storage device comprising:
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a disk comprising a plurality of tracks; a head actuated over the disk, the head comprising a read element radially offset from a write element; and control circuitry configured to; write a first pattern to a target track; read the first pattern from the target track to generate a first read signal; generate a first quality metric based on the first read signal; write a second pattern to the target track, wherein the second pattern is different from the first pattern; read the second pattern from the target track to generate a second read signal; generate a second quality metric based on the second read signal; generate a third quality metric based on the first quality metric and the second quality metric; and measure the radial offset of the read element and write element based on the third quality metric. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of operating a data storage device, the method comprising:
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using a head to write a first pattern to a single track on a disk; using the head to read the first pattern from the single track to generate a first read signal; generating a first quality metric based on the first read signal; using the head to write a second pattern to the single track, wherein the second pattern is different from the first pattern; using the head to read the second pattern from the single track to generate a second read signal; generating a second quality metric based on the second read signal; and measuring a radial offset of a read element and a write element of the head based on the first and second quality metrics. - View Dependent Claims (23, 24, 25)
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26. A method of operating a data storage device, the method comprising:
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using a head to write a first pattern to a target track on a disk; using the head to read the first pattern from the target track to generate a first read signal; generating a first quality metric based on the first read signal; using the head to write a second pattern to the target track, wherein the second pattern is different from the first pattern; using the head to read the second pattern from the target track to generate a second read signal; generating a second quality metric based on the second read signal; generating a third quality metric based on the first quality metric and the second quality metric; and measuring the radial offset of a read element and a write element of the head based on the third quality metric. - View Dependent Claims (27, 28, 29)
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Specification