Data storage device employing mirrored cross-track profiles for top and bottom disk surfaces
First Claim
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1. A data storage device comprising:
- a disk comprising a top disk surface comprising a plurality of data tracks and a bottom disk surface comprising a plurality of data tracks;
a first head actuated over the top disk surface, wherein the first head exhibits a first cross-track profile when reading a reference track on a reference disk surface, the first cross-track profile comprising a first undershoot near a first edge of the reference track and a second undershoot near a second edge of the reference track; and
a second head actuated over the bottom disk surface, wherein the second head exhibits a second cross-track profile when reading the reference track on the reference disk surface, the second cross-track profile comprising a first undershoot near the first edge of the reference track and a second undershoot near the second edge of the reference track;
wherein;
the first and second cross-track profiles are generated by scanning the first head and the second head over a width of the reference track while measuring an amplitude of a resulting read signal;
when the first head is over the top disk surface, the first undershoot of the first cross-track profile is closer to an inner diameter of the disk and the second undershoot of the first cross-track profile is closer to an outer diameter of the disk;
when the second head is over the bottom disk surface, the second undershoot of the second cross-track profile is closer to the inner diameter of the disk and the first undershoot of the second cross-track profile is closer to the outer diameter of the disk;
the first undershoot of the first cross-track profile comprises an amplitude greater than an amplitude of the second undershoot of the first cross-track profile; and
the second undershoot of the second cross-track profile comprises an amplitude greater than an amplitude of the first undershoot of the second cross-track profile.
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Abstract
A data storage device is disclosed wherein when a first head is over a top disk surface, a first undershoot of a first cross-track profile is closer to an inner diameter of a disk and a second undershoot of the first cross-track profile is closer to an outer diameter of the disk. When a second head is over a bottom disk surface, a second undershoot of a second cross-track profile is closer to the inner diameter of the disk and a first undershoot of the second cross-track profile is closer to the outer diameter of the disk.
466 Citations
8 Claims
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1. A data storage device comprising:
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a disk comprising a top disk surface comprising a plurality of data tracks and a bottom disk surface comprising a plurality of data tracks; a first head actuated over the top disk surface, wherein the first head exhibits a first cross-track profile when reading a reference track on a reference disk surface, the first cross-track profile comprising a first undershoot near a first edge of the reference track and a second undershoot near a second edge of the reference track; and a second head actuated over the bottom disk surface, wherein the second head exhibits a second cross-track profile when reading the reference track on the reference disk surface, the second cross-track profile comprising a first undershoot near the first edge of the reference track and a second undershoot near the second edge of the reference track; wherein; the first and second cross-track profiles are generated by scanning the first head and the second head over a width of the reference track while measuring an amplitude of a resulting read signal; when the first head is over the top disk surface, the first undershoot of the first cross-track profile is closer to an inner diameter of the disk and the second undershoot of the first cross-track profile is closer to an outer diameter of the disk; when the second head is over the bottom disk surface, the second undershoot of the second cross-track profile is closer to the inner diameter of the disk and the first undershoot of the second cross-track profile is closer to the outer diameter of the disk; the first undershoot of the first cross-track profile comprises an amplitude greater than an amplitude of the second undershoot of the first cross-track profile; and the second undershoot of the second cross-track profile comprises an amplitude greater than an amplitude of the first undershoot of the second cross-track profile. - View Dependent Claims (2, 3, 4)
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5. A method of operating a data storage device, the method comprising:
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actuating a first head over a top disk surface of a disk, wherein the first head exhibits a first cross-track profile when reading a reference track on a reference disk surface, the first cross-track profile comprising a first undershoot near a first edge of the reference track and a second undershoot near a second edge of the reference track; and actuating a second head over a bottom disk surface of the disk, wherein the second head exhibits a second cross-track profile when reading the reference track on the reference disk surface, the second cross-track profile comprising a first undershoot near the first edge of the reference track and a second undershoot near the second edge of the reference track; wherein; the first and second cross-track profiles are generated by scanning the first head and the second head over a width of the reference track while measuring an amplitude of a resulting read signal; when the first head is over the top disk surface, the first undershoot of the first cross-track profile is closer to an inner diameter of the disk and the second undershoot of the first cross-track profile is closer to an outer diameter of the disk; when the second head is over the bottom disk surface, the second undershoot of the second cross-track profile is closer to the inner diameter of the disk and the first undershoot of the second cross-track profile is closer to the outer diameter of the disk; the first undershoot of the first cross-track profile comprises an amplitude greater than an amplitude of the second undershoot of the first cross-track profile; and the second undershoot of the second cross-track profile comprises an amplitude greater than an amplitude of the first undershoot of the second cross-track profile. - View Dependent Claims (6, 7, 8)
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Specification