Patent ID: 6693763
Filing Date: 2004-02-17
Classification: G11B

Abstract:
A method for linearizing a non-linear hysteresis loop displacement response of a microactuator of a disc drive by steps comprising:(a) selecting an equation for modeling the microactuator to provide a linear displacement response of the microactuator responding to an applied voltage; (b) servoing on a set-point of a servo track with a first read/write head supported by a first actuator arm while using a second read/write head supported by a second actuator arm to write a burst pattern on a second selected rotatable disc surface rotating beneath the second selected read/write head; (c) determining and using a pair of digital to analog converter count burst width values from a series of burst scans of the burst pattern written to the second selected rotatable disc surface to derive a set of constants for use with the equation to linearize the microactuator response; and (d) applying the constants and the equation to subsequently acquired digital to analog converter counts to provide a substantially linear displacement response of the microactuator responding to the voltage applied to the microactuator.