Servo self-write disk drive with dual-stage actuator

Details Servo self-write disk drive with dual-stage actuator Servo self-write disk drive with dual-stage actuator

2006-10-03

2006-10-03

Tran, Sinh (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078050

Reexamination Certificate

active

07116510

ABSTRACT:
A hard disk drive (HDD) uses a technique for setting the initial servo track pitch for a servo system by using a secondary actuator, such as a microactuator or a milliactuator. The actuator of the HDD is positioned against a crash stop and a burst pattern is written on a hard disk while the read/write head is in a first position. A bias voltage of the secondary actuator is incrementally changed to change the position of the read/write head and a burst pattern is written for each change. The overlap is determined as a sum of the averaged amplitudes of the burst patterns that are adjacent to a selected burst pattern divided by the averaged amplitude of the selected burst pattern. The process is terminated when the determined overlap for each selected burst pattern is within a selected criterion of a target overlap value.

REFERENCES:
patent: 5936805 (1999-08-01), Imaino
patent: 6040955 (2000-03-01), Brown et al.
patent: 6344942 (2002-02-01), Yarmchuk
patent: 6429989 (2002-08-01), Schultz et al.
patent: 6493176 (2002-12-01), Deng et al.
patent: 6519107 (2003-02-01), Ehrlich et al.
patent: 6738215 (2004-05-01), Yatsu

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