Disk drive writing wedge RRO values in a butterfly pattern

Details Disk drive writing wedge RRO values in a butterfly pattern Disk drive writing wedge RRO values in a butterfly pattern

2007-10-26

2009-08-18

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077080

Reexamination Certificate

active

07576941

ABSTRACT:
A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate first read wedge repeatable runout (WRRO) values. A first seek operation of the head positions the read element over a second track, and the second track is read to generate first write WRRO values. The first write WRRO values are used to write the first read WRRO values to the first track. A second seek operation of the head positions the read element over a third track, and the third track is read to generate second write WRRO values. The second write WRRO values are used to write the first write WRRO values to the second track.

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Tan et al., “Signal Processing for Perpendicular Recording Channels With Intertrack Interference”, IEEE Transactions on Magnetics, Feb. 2005, pp. 730-735, vol. 41, No. 2.
U.S. Appl. No. 11/165,638, filed Jun. 23, 2005, 18 pages.
U.S. Appl. No. 11/847,110, filed Aug. 29, 2007, 23 pages.

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