A disk drive is disclosed comprising a disk including a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted by a sync mark at a sync mark interval, and a head actuated over the disk. The spiral tracks are demodulated by reading a spiral track to generate a spiral track crossing signal g(x.sub.n), where x.sub.n is a time in a demodulation window, and determining a position error signal (PES) by determining a time-shift L that maximizes a correlation between g(x.sub.n) and a function that estimates a nominal spiral track crossing signal having the time-shift of L.

 
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< Pre-programming of a preamplifier in a disk drive to improve servo-writing characteristics

> Disk drive comprising a servo accelerator employing a dual state variable memory

> Disk drive motor having a rotor with at least three bendable balancing tabs

~ 00577