Higher-order state estimator for low TMR in hard disk drives

Details Higher-order state estimator for low TMR in hard disk drives Higher-order state estimator for low TMR in hard disk drives

2008-05-27

2008-05-27

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07379262

ABSTRACT:
A hard disk drive with a servo circuit that provides a control signal to a voice coil motor to perform a servo to align a head with a disk track of the drive. The servo circuit includes a fifth order state estimator that provides five estimates that are used to create the control signal. The fifth order state estimator may incorporate a first flexible mode of the voice coil motor to calculate the estimates.

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patent: 2002/0054451 (2002-05-01), Moon et al.

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