Importance

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Abstract

The invention is a method of calibrating a position error signal (PES) to overcome the problem of a measured displacement or PES that varies as a non-linear function of real displacement when the read transducer is positioned to either side of a null position where the PES equals zero. The PES is notably nonlinear while reading servo burst information with a Magneto-Resistive (MR) head which has nonlinear magnetic characteristics. The method uniquely calibrates the measured PES to provide a corrected PES by measuring the PES while slowly moving the MR head at a constant radial velocity, determining the actual displacement corresponding to each measured PES, and comparing the measured PES with the ideal PES for the corresponding displacement to develop a correction table for providing a corrected PES when given a measured PES. The method uniquely relies on the standard servo burst data and may, therefore, be performed at anytime without need for a servowriter or any sort of special calibration track.

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First Claim