Method of positioning a head in a disk drive using groups of ser

Details Method of positioning a head in a disk drive using groups of ser Method of positioning a head in a disk drive using groups of ser

1999-08-26

2000-03-28

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, G11B 5596

Patent

active

060439521

ABSTRACT:
A method of positioning a head in a disk drive is disclosed. The method includes reading a first group of servo bursts and detecting a first error value based upon the head position, reading a second group of servo bursts and detecting a second error value based upon the head position, and comparing the absolute values of the first and second error values to position the head. Preferably, the first group of servo bursts is associated with a Norms curve, the second group of servo bursts is associated with a Quads curve, the Norms curve is used for positioning the head if the absolute value of the first error value is less than the absolute value of the second error value, and the Quads curve is used for positioning the head if the absolute value of the second error value is less than the absolute value of the first error value. It is also preferred that the first and second groups of servo bursts are circumferentially adjacent to one another and each span two track widths, the first group of servo bursts includes first and second servo bursts that each span one track width, and the second group of servo bursts includes third and fourth servo bursts that span less than and greater than one track width, respectively.

REFERENCES:
patent: 5436773 (1995-07-01), Hanson
patent: 5771131 (1998-06-01), Pirzadeh
patent: 5825579 (1998-10-01), Cheung et al.
patent: 5892634 (1999-04-01), Ito et al.
patent: 5923492 (1999-07-01), Liikanen

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