Method and apparatus for writing spiral servo pattern in a...

Details Method and apparatus for writing spiral servo pattern in a... Method and apparatus for writing spiral servo pattern in a...

2007-12-20

2009-12-08

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S051000, C360S078040

Reexamination Certificate

active

07630161

ABSTRACT:
According to one embodiment, a servo writing apparatus that writes a multi-spiral servo pattern to a disk medium is disclosed. The apparatus has a servo controller that generates a servo clock determining a head seek start timing, a servo pattern generator that generates a sector index pulse determining the interval at which a multi-spiral servo pattern is written to the disk medium, a clock phase difference measuring unit that measures a phase difference between the servo clock and the sector index pulse, and a controller that adjusts the measured phase difference.

REFERENCES:
patent: 5748398 (1998-05-01), Seo
patent: 6785075 (2004-08-01), Bryant et al.
patent: 6965489 (2005-11-01), Lee et al.
patent: 7253985 (2007-08-01), Gami et al.
patent: 2007/0195445 (2007-08-01), Vanlaanen et al.
patent: 03-209680 (1991-09-01), None

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