Patent Number: 7,042,673

Title: Hard disk drive calibration method and apparatus

Abstract: A method of calibrating parameters of an apparatus for measuring a back electromotive force (BEMF) of a voice coil motor (VCM) for moving a head on a disk, the apparatus including the VCM having a coil resistance Rm, a coil inductance Lm, and a sensing resistance Rs, including: controlling the VCM to sequentially perform a track following operation of the head on a first track, a transferring operation of the head from the first track to a second track, and a track following operation of the head on the second track; sampling a differential voltage Vadc between a voltage across the VCM and a voltage across the sensing resistance Rs and a VCM driving current Im during the transferring operation; calculating a slope S based on a ratio of a first integration value to a second integration value, where the first integration value is obtained by integrating a product of the sampled differential voltage Vadc and the VCM driving current Im during the transferring operation, the second integration value being obtained by integrating a square of the VCM driving current Im during the transferring operation, the slope S being defined by the equation S=Rm-Gb.times.Rs, Gb being a gain of an amplifier for amplifying the voltage across the sensing resistance Rs; and calibrating the parameters of the apparatus using the slope S.

Inventors: Jeong; Jun (Suwon-si, KR)

Assignee: Samsung Electronics Co., Ltd.

International Classification: G11B 21/02 (20060101)

Expiration Date: 5/09/02018