Patent ID: 7009803
Filing Date: 2006-03-07
Classification: G11B

Abstract:
1. A method of controlling a magnetic head to follow a track on a rotating disk surface in a hard disk drive, comprising the steps of: a micro-actuator control creating a micro-actuator control signal to stimulate a micro-actuator based upon a micro-actuator direction; wherein said magnetic head is positioned near said track by an effect of said micro-actuator and by an effect of a voice coil motor, both included said hard disk drive; a voice coil motor control creating a voice coil control signal based upon a voice coil motor direction; notch filtering said voice coil control signal to remove at least one significant excitation resonance to create a notch filtered voice coil control signal; amplifying said notch filtered voice coil control signal based upon a tuning gain to create a tuned voice coil control signal stimulating said voice coil motor; removing a Positional Error Signal (PES) from a track following command to create said micro-actuator direction; wherein said PES signal is based upon said effect of said voice coil motor and based upon said effect of said micro-actuator in positioning said magnetic head near said track; decoupling feedback filtering said micro-actuator control signal to create a decoupling feedback signal; and removing said PES and said decoupling feedback signal from said track following command to create said voice coil motor direction.