Reducing effects of rotational vibration in disk drive

Details Reducing effects of rotational vibration in disk drive Reducing effects of rotational vibration in disk drive

2005-08-30

2005-08-30

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077030, C360S077070

Reexamination Certificate

active

06937423

ABSTRACT:
A method of reducing rotational vibration effects in a disk drive by sensing vibration in a sensor and generating corresponding sensor data; deriving a statistical sensor (SS) value based on the sensor data; deriving a statistical position error signal (SPES) value from servo sectors read by the head; comparing the SS value to a SS-threshold value; comparing SPES value to a SPES-threshold value; and generating a feed-forward command effort signal for reducing rotational vibration effects if the SS value exceeds the SS-threshold value and if SPES value exceeds the SPES-threshold value.

REFERENCES:
patent: 5299075 (1994-03-01), Hanks
patent: 6414813 (2002-07-01), Cvancara
patent: 2004/0042114 (2004-03-01), Kusumoto

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