Patent ID: 7576942
Filing Date: 2009-08-18
Classification: G11B

Abstract:
1. A data storage system comprising: a data storage medium comprising: a transducer head that is positionable over a desired track and finely positionable based on readback signals generated in response to the permanent servo sectors; a servo demodulator connected to receive readback signals generated by the transducer head and to generate a first position error signal in response to the first null burst and a second position error signal in response to the second null burst, and uses region information provided by the first and second position error signals to generate a first region-based displacement estimate and a second region-based displacement estimate, wherein the servo demodulator calculates a final displacement estimate based on the first and second region-based displacement estimates; and a controller for generating servo control instructions to control the positioning of the transducer head over a desired track based on the final displacement estimate generated by the servo demodulator.