Patent ID: 8743504

Claim:
A disk drive comprising: a first disk surface and a second disk surface, wherein the first disk surface comprises a plurality of servo sectors defining a plurality of concentric servo tracks, wherein: the concentric servo tracks form a plurality of servo zones; and a servo data rate of servo sectors in a first servo zone is different than a servo data rate of servo sectors in a second servo zone; a first head actuated over the first disk surface and a second head actuated over the second disk surface; and control circuitry operable to: read a first servo sector of the first disk surface using the first head to generate a read signal; process the read signal to generate a first phase error; generate a first clock at a frequency proximate the servo data rate of the first data sector; synchronize read signal samples in response to the first phase error and the first clock to generate synchronous samples; detect the servo data in the first servo sector in response to the synchronous samples; process the read signal to generate a second phase error; generate a second clock in response to the second phase error; and write a spiral servo track to the second disk surface using the second head and the second clock.