Reducing spiral write time and clock track drift while...

Details Reducing spiral write time and clock track drift while... Reducing spiral write time and clock track drift while...

2006-12-05

2006-12-05

Nguyen, Hoa Thi (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S051000

Reexamination Certificate

active

07145744

ABSTRACT:
Disclosed is a method for reducing spiral write time and clock reference drift while writing spiral reference patterns on a disk of a disk drive. The method includes: controlling a radial location of a head for writing a first band of tracks near one of an outer diameter (OD) circumference of the disk or an inner diameter (ID) circumference of the disk and for writing a second band of tracks near the other of the OD circumference of the disk or the ID circumference of the disk, respectively, wherein a substantial majority of the tracks each include a plurality of servo sectors including a track number and a sync mark; measuring a distance between first and second reference center positions of reference center tracks of the first and second bands of tracks; and writing a spiral reference pattern therebetween.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 6992848 (2006-01-01), Agarwal et al.
patent: 7088533 (2006-08-01), Shepherd et al.

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