Method for measuring track width of hard disk drive

Details Method for measuring track width of hard disk drive Method for measuring track width of hard disk drive

2007-01-31

2009-02-10

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077080

Reexamination Certificate

active

07489467

ABSTRACT:
In a method of measuring track widths in a hard disk drive a plurality of estimation values are calculated based on differences in intensity between a plurality first measurement signals produced in relation to a head of the hard disk drive based on a plurality of burst signals stored in servo sectors of a track when the head moves along the track on a first side of a center of the track, and a plurality of second measurement signals produced in relation to the head of the hard disk drive based on the plurality of burst signals when the head moves along the track on a second side of the center of the track opposite the first side. The estimation values are then normalized, and excessive variation in the track widths is detected based on the normalized estimation values.

REFERENCES:
patent: 6064542 (2000-05-01), Shepherd
patent: 6313964 (2001-11-01), Lamberts et al.
patent: 2002/0039247 (2002-04-01), Bi et al.
patent: 2006/0109584 (2006-05-01), Chung et al.
patent: 2008/0002283 (2008-01-01), Chase et al.
patent: 2003-331545 (2003-11-01), None

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