Dynamic magnetic information storage or retrieval – Modulating or demodulating
Reexamination Certificate
2006-05-30
2006-05-30
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Modulating or demodulating
C360S048000, C360S049000
Reexamination Certificate
active
07054083
ABSTRACT:
Systems are provided for improving servo-demodulation robustness, especially when used with a disk having zone bit recorded servo wedges. The systems include a first servo demodulator adapted to search for a servo address mark (SAM) pattern, 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 systems also include a second servo demodulator adapted to search for the SAM pattern, 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 microprocessor can then determine which of the first and second zones a head is reading, based at least in part on which of the first and second demodulators detects the SAM pattern.
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Fliesler & Meyer LLP
Matsushita Electric - Industrial Co., Ltd.
Sniezek Andrew L.
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