Method for writing spiral reference servo signal in hard...

Details Method for writing spiral reference servo signal in hard... Method for writing spiral reference servo signal in hard...

2008-01-22

2008-01-22

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07321479

ABSTRACT:
A method for writing a spiral reference servo signal suitable for a self-servo writing method in a hard disk drive includes writing a first reference pattern in an end direction of a spiral reference servo signal writing concentrically on the disk; writing a spiral reference servo signal on a current spiral track from a reference writing start position of the current spiral track; detecting a moving angle of a head to the first reference pattern, which corresponds to a distance from the reference writing start position to a reference writing end position of the spiral reference servo signal in the case that thermal expansion of the disk does not exist; compensating for a driving speed of the head with reference to the detected moving angle of the head; and writing the spiral reference servo signal on a next spiral track at a compensated driving speed of the head.

REFERENCES:
patent: 6992851 (2006-01-01), Cloke
patent: 6992852 (2006-01-01), Ying et al.
patent: 7123433 (2006-10-01), Melrose et al.
patent: 7145744 (2006-12-01), Clawson et al.
patent: 2000-222843 (2000-08-01), None
patent: 2002-342901 (2002-11-01), None

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