Patent ID: 7952830

Claim:
A hard disk drive, comprising: a disk base; a spindle motor mounted on said disk base and coupled to at least one disk to create at least one rotating disk surface containing at least one track with a repeated pattern of bits; a voice coil motor pivotably mounted to said disk base to position via a head gimbal assembly to at least one slider affected by a vertical micro-actuator at a voltage to a flying height over said track on said rotating disk surface; and a processor stimulating said vertical micro-actuator with a vertical voltage to receive from said slider data of said track to create a first harmonic amplitude and a third harmonic amplitude, with said first harmonic amplitude and said third harmonic amplitudes used to create an entry in a first data set with equation (1) Δ d= (λ/4π)ln( A a-1st A b-3rd /A b-1st A a-3rd ) and said third harmonic amplitude used to create said entry in a second data set with equation (2) Δ d= (λ/4π)ln( A a-1st /A b-1st ) at said vertical voltage, with said processor calculating a first slope of said first set and a second slope said second data set, with said processor calculating the ratio of said first slope to said second slope to determine a conversion factor used to create a table of voltage applied to said vertical micro-actuator of said slider and said slider's change in flying height over said rotating disk surface.