Method to correct radial misposition of data tracks

Details Method to correct radial misposition of data tracks Method to correct radial misposition of data tracks

2005-11-15

2005-11-15

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

06965491

ABSTRACT:
A disk drive measures the radial misposition of tracks and repositions the tracks at regularly spaced intervals. Written in runout (WRO) in servo bursts is determined to calculate track spacing and squeeze among adjacent tracks. Tracks with improper spacing are repositioned by adding a squeeze correction term to the servo wedges. Thereafter, when the disk drive operates to store data, the servo bursts are used to calculate a position error signal (PES), and the squeeze correction term is combined with the PES to position the head at a proper track radius.

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patent: 6411461 (2002-06-01), Szita
patent: 6608731 (2003-08-01), Szita
patent: 6624963 (2003-09-01), Szita
patent: 6654198 (2003-11-01), Liu et al.
patent: 6714376 (2004-03-01), Brunnett et al.
patent: 6751042 (2004-06-01), Bi et al.
patent: 6785084 (2004-08-01), Szita

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