Magnetic recording disk and disk drive with track...

Details Magnetic recording disk and disk drive with track... Magnetic recording disk and disk drive with track...

2011-08-16

2011-08-16

Olson, Jason C (Department: 2627)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

C360S077070

Reexamination Certificate

active

08000048

ABSTRACT:
A magnetic recording disk drive has a disk with a head positioning servo pattern of multiple circumferentially-spaced chevron patterns of discrete patterned servo islands. The disk drive has servo electronics that decodes the chevron patterns to determine the absolute radial position of the head without the need for separate track identification fields. The chevron pattern with the smallest radial period has a radial period P1and each of the other chevron patterns has a period which is a unique multiple of P1. In one embodiment the first chevron pattern read by the head has period P1and each successive chevron pattern read by the head has a period that is greater than the period of the chevron pattern immediately preceding it such that the period of each chevron pattern progressively increases.

REFERENCES:
patent: 5521929 (1996-05-01), Weng et al.
patent: 6754016 (2004-06-01), Messner et al.
patent: 7095580 (2006-08-01), Ehrlich et al.
patent: 7167329 (2007-01-01), Baker
patent: 7206148 (2007-04-01), Ehrlich
patent: 7612961 (2009-11-01), Yamamoto

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