Method for establishing and maintaining radial position for...

Details Method for establishing and maintaining radial position for... Method for establishing and maintaining radial position for...

2008-11-17

2010-11-02

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S051000

Reexamination Certificate

active

07826167

ABSTRACT:
Magnetic reference patterns may be generated on a disk or other magnetic media without the need for seed wedges. This involves writing a first magnetic reference pattern to the disk with a servo writer. The disk may then be transferred to a hard disk drive. Control circuitry within the hard disk drive may recognize the first magnetic reference pattern and then position a RW head within the hard disk drive based on the first magnetic reference pattern. As the RW drive is accurately positioned based on the first magnetic reference pattern a second magnetic reference pattern may be written to the disk using the RW head. The RW head location is determined based on the velocity and phase between the read-write head and spiral sync marks contained within the first magnetic reference pattern.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 7088533 (2006-08-01), Shepherd et al.
patent: 2007/0165319 (2007-07-01), Fisher

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