Dynamic magnetic information storage or retrieval – Modulating or demodulating
Reexamination Certificate
2006-07-04
2006-07-04
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Modulating or demodulating
C360S048000, C360S049000
Reexamination Certificate
active
07072128
ABSTRACT:
Methods are provided for improving servo-demodulation robustness, especially when used with a disk having zone bit recorded servo wedges. A servo address mark (SAM) pattern is searched for, within a servo wedge, at a first nominal frequency useful for searching for the SAM pattern if the servo wedge is within a first zone. The SAM pattern is also searched for, within the same servo wedge, at a second nominal frequency useful for searching for the SAM pattern if the servo wedge is within the second zone. A determination of which one of two zones a head is reading, can then based at least in part on which nominal frequency was used to successfully detect the SAM pattern.
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Abramovitch et al., “Customizable Coherent Servo Demodulation for Disk Drives,” Sep. 1998, IEEEE/ASME Transactions on Mechatronics, vol. 3, No. 3, pp. 184-193.
Fliesler & Meyer LLP
Sniezek Andrew L.
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