Patterned media magnetic recording disk drive with write...

Details Patterned media magnetic recording disk drive with write... Patterned media magnetic recording disk drive with write...

2009-06-03

2010-12-07

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07848048

ABSTRACT:
A patterned-media magnetic recording disk drive has compensation for write head track misregistration (TMR) from the track centerline. As the disk rotates, the read head detects angularly spaced servo sectors and generates a position error signal (PES) which is used by the servo control system to maintain the read head on track. As the disk rotates, the read head also detects angularly spaced synchronization marks, which are used to control the write clock so that magnetization reversal of the magnetic write field from the write head is synchronized with the position of the data islands. If there is TMR of the write head, there will be an effective shift of Δφ in the timing of when the center of the data islands pass through the write field. The disk drive includes write clock phase adjustment circuitry that correlates the PES with Δφ to compensate for TMR of the write head.

REFERENCES:
patent: 4965782 (1990-10-01), Mathews
patent: 6411453 (2002-06-01), Chainer et al.
patent: 2006/0119965 (2006-06-01), Ohno
patent: 2009/0244765 (2009-10-01), Albrecht
patent: 2001243601 (2001-09-01), None
Moritz et al., “Patterned Media Made From Pre-Etched Wafers: A Promising Route Toward Ultrahigh-Density Magnetic Recording”, IEEE Transactions on Magnetics, vol. 38, No. 4, Jul. 2002, pp. 1731-1736.

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