Method for differential timing based servo pattern for magnetic-based storage media
AssigneeInternational Business Machines Corporation
InventorsDaniel Winarski, Nils Haustein, Craig A. Klein
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Abstract
Provided is a method for differential timing based servo pattern for magnetic-based storage media. A magnetic storage media includes a magnetic first-pole polarity initialized servo track segment and a magnetic second-pole polarity differential timing based servo pattern recorded on the magnetic first-pole polarity initialized servo track segment. The magnetic second-pole polarity differential timing based servo pattern represents magnetic encoded servo position information for facilitating a determination of a servo position error signal exclusive of noise.
Claims20
A method for generating a servo pattern onto a magnetic storage media, comprising:
- generating a first burst of slash stripes in a first direction;
- generating a second burst of slash stripes in a second direction following the first burst;
- generating a third burst of slash stripes in the first direction following the second burst,
- wherein the servo pattern is generated such that a servo position error signal is calculated from the servo pattern by:
- determining a first position error timing generated from the first burst and the second burst;
- determining a second position error timing from the second burst and the third burst;
- calculating a differential of the first position error timing and a first noise associated with the first position error timing and the second position error timing and a second noise associated with the second position error timing.
The method of claim of 4, wherein determining the first noise comprises determining a noise associated with each of the n first-second burst position error timings and wherein determining the second noise comprises determining a noise associated with each of the n second-third burst position error timings.
A method for generating a servo pattern, comprising:
- generating a first burst group comprising a first burst of slash stripes in a first direction, a second burst of slash stripes in a second direction following the first burst, and a third burst of slash stripes in the first direction following the second burst;
- generating a second burst group comprising fourth burst of slash stripes in the second direction, a fifth burst of slash stripes in the first direction following the fourth burst, and a sixth burst of slash stripes in the second direction following the fifth burst;
- wherein the servo pattern is generated such that a combined servo position error signal is calculated from a first servo position error signal and a second server position error signal,
- wherein the first servo position error signal is calculated by:
- determining a first position error timing from the first burst and the second burst;
- determining a second position error timing from the second burst and the third burst;
- and
- calculating a differential of the first position error timing and a first noise associated with the first position error timing and the second position error timing and a second noise associated with the second position error timing;
- wherein the second servo position error signal is calculated by:
- determining a third position error timing from the fourth burst and the fifth burst;
- determining a fourth position error timing from the fourth burst and the sixth burst;
- and
- calculating a differential of the third position error timing and a third noise associated with the third position error timing and the fourth position error timing and a fourth noise associated with the second position error timing.
The method of claim of 11,
- wherein determining the first noise comprises determining a noise associated with each of the n first-second burst position error timings,
- wherein determining the second noise comprises determining a noise associated with each of the n second-third burst position error timings,
- wherein determining the third noise comprises determining a noise associated with each of the n third-fourth burst position error timings,
- wherein determining the fourth noise comprises determining a noise associated with each of the n fifth-sixth burst position error timings.
Dependencies are inferred from the claim text.