Method for nonsequentially writing reference spiral servo...

Details Method for nonsequentially writing reference spiral servo... Method for nonsequentially writing reference spiral servo...

2006-01-31

2006-01-31

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

06992851

ABSTRACT:
A method is disclosed for reducing disk expansion effects while writing spiral reference patterns on a disk. The disk drive comprises control circuitry and a head disk assembly (HDA). In the method, an external spiral servo writer is used to control a radial location of the head for writing a plurality of the spiral reference patterns in an order such that at least two of the spiral reference patterns are not written temporally sequential to an adjacent spiral reference pattern. The head internal to the disk drive is used to read the spiral reference patterns in order to write product servo bursts to the disk, thereby defining a plurality of radially spaced, concentric data tracks.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 6181500 (2001-01-01), Serrano et al.
patent: 6507450 (2003-01-01), Elliott

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