Disk drive computing data center off-track from repeatable...

Details Disk drive computing data center off-track from repeatable... Disk drive computing data center off-track from repeatable...

2011-06-14

2011-06-14

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077080

Reexamination Certificate

active

07961422

ABSTRACT:
A disk drive is disclosed comprising a disk having a plurality of servo tracks that define a plurality of data tracks, and a head actuated over the disk by a voice coil motor (VCM), wherein the head comprises a read element offset radially from a write element. The read element is positioned over a first servo track and the write element is positioned over a second servo track, and a first repeatable runout (RRO) of the first servo track is measured. The read element is positioned over the second servo track, and a second RRO of the second servo track is measured. A data center off-track is computed in response to the first RRO and the second RRO.

REFERENCES:
patent: 6510017 (2003-01-01), Abdelnour
patent: 6549362 (2003-04-01), Melrose et al.
patent: 6657810 (2003-12-01), Kupferman
patent: 6965491 (2005-11-01), Perlmutter et al.
patent: 7304819 (2007-12-01), Melkote et al.
patent: 7423834 (2008-09-01), Sun et al.
patent: 7646559 (2010-01-01), Cheung et al.

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