Method for preventing radial error propagation during...

Details Method for preventing radial error propagation during... Method for preventing radial error propagation during...

2005-11-08

2005-11-08

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

06963465

ABSTRACT:
The present invention may be embodied in a method for preventing radial error propagation during self-servowriting of concentric tracks on a magnetic disk in a disk drive. Each written track comprises a plurality of embedded servo sectors that define a circumferential path and that eventually form corresponding servo wedges extending radially across the magnetic disk such that each servo sector t of a track corresponds to a particular servo wedge. In the method comprising, track following is performed along a previously written track and a position error signal is determined for each servo sector. A correction value is recursively estimated for each servo sector of an adjacent track. The correction value is for use in correcting a position error signal determined using the corresponding servo sector of the adjacent track to prevent radial error propagation from previously written track to the adjacent track.

REFERENCES:
patent: 5541784 (1996-07-01), Cribbs et al.
patent: 5659426 (1997-08-01), Aoki
patent: 6608731 (2003-08-01), Szita
patent: 2002/0036859 (2002-03-01), Liu et al.
H. Melkote et. al, “A study of radial error propagation and self servowriting in disk drives”, in Proceedings of the American Control Conference, Denver, CO, Jul. 2002.
D. Arzelier, D. Peaucelle, “An iterative method for mixed H2/Hinfinity synthesis via static output-feedback”, CDC, Las Vegas, 2002.

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