Disk drive, positioning method for head, and servo system

Details Disk drive, positioning method for head, and servo system Disk drive, positioning method for head, and servo system

2007-01-16

2007-01-16

Sniezek, Andrew L. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

11190482

ABSTRACT:
Embodiments of the invention compensate for repeatable run-out errors without causing servo system instability. In one embodiment, HDD has a peak filter on a feedback route of a servo system. The peak filter is designed so that a rotating frequency of a magnetic disk, the high-frequency components contained in the rotating frequency and a peak match the rotating frequency and the high-frequency components. Insertion of a required peak filter into the servo system allows compensation for a repeatable run-out (RRO) error due to an event such as a deviation from the roundness of a track. Also, since a Nyquist diagram of the system satisfies required characteristics, a repeatable run-out error may be compensated for without causing instability of the servo system due to use of the peak filter.

REFERENCES:
patent: 6937424 (2005-08-01), Chang et al.
patent: 07-050075 (1995-02-01), None
patent: 08-328664 (1996-12-01), None
patent: 10-208418 (1998-08-01), None
patent: 11-120720 (1999-04-01), None
patent: WO 00/68939 (2000-11-01), None

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