Delay clock track read back data to compensate time variance...

Details Delay clock track read back data to compensate time variance... Delay clock track read back data to compensate time variance...

2007-08-07

2007-08-07

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S051000, C360S077080

Reexamination Certificate

active

11369600

ABSTRACT:
A method for writing servo information onto a disk of a hard disk drive with a servo writer. The disk has a circumferential index and a band of servo reference tracks. The circumferential index is detected from a clock signal generated from a clock track of the disk. The reference tracks include radial indices. A spiral servo pattern is written upon the detection of the circumferential index and a radial index. The servo writer includes a phase detector that detects changes in the relative position of the circumferential and radial indices and a delay circuit that delays the clock signal to offset such changes.

REFERENCES:
patent: 5748398 (1998-05-01), Seo

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