A servo compensation processor comprises a peak locator that estimates a location of a peak amplitude of a waveform with respect to a plurality of samples of the waveform. The waveform is generated as a read head moves across servo tracks. A compensator determines a compensation amount based on a compensation...http://www.google.com/patents/US7463437?utm_source=gb-gplus-sharePatent US7463437 - Demodulation compensation for spiral servo tracks in hard disk drives
