Patent ID: 7843662

Claim:
A disk drive comprising: a first disk surface and a second disk surface, wherein the first disk surface comprises a plurality of concentric servo sectors extending across substantially an entire radius of the first disk surface; a first head actuated over the first disk surface and a second head actuated over the second disk surface; a voice coil motor (VCM) for actuating the first and second heads radially over the respective disk surfaces; and control circuitry operable to: read the concentric servo sectors across substantially the entire radius of the first disk surface using the first head to generate a read signal; process the read signal to generate a position error signal (PES) representing a radial location of the first head relative to the first disk surface; and process the PES to generate a control signal applied to the VCM to move the second head radially over the second disk surface while writing a spiral servo track on the second disk surface.