Probe position error detecting method and apparatus in...

Details Probe position error detecting method and apparatus in... Probe position error detecting method and apparatus in...

2005-08-12

2009-02-10

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

C977S947000

Reexamination Certificate

active

07489619

ABSTRACT:
A probe position error detecting method and apparatus in a probe-based data storage system are provided. The method includes preparing servo codes, which are Gray codes. The Gray codes have a Hamming distance of 1 and satisfy alternate conditions for Q (a natural number) and Q+1, the conditions being based on the numbers of “1” bits of codewords of the Gray codes. The method further includes detecting a probe position error from a signal read by a servo probe when the servo probe consecutively scans “1” bits of codewords of the servo codes when tracking. The apparatus includes: a plurality of servo probes; a tracking condition checker; a plurality of position error detectors that correspond to the plurality of servo probes, respectively; and an average position error calculator. Probe position errors are be detected with a stable noise characteristic using fewer probes.

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