Patent ID: 7538968

Claim:
A magnetic recording/reproducing apparatus comprising: a reproducing unit that performs a reproducing process on a magnetic recording medium that includes a servo area where servo data used for detecting a position of a magnetic head on the magnetic recording medium is recorded, and a writable data area, arranged side by side with the servo area in the track direction, on which user data is written by the magnetic head, the servo area including a preamble area where a preamble recording pattern that represents data used for providing a clock synchronization of the servo data is formed by a plurality of magnetic sections, and a burst area where data used for detecting a relative position of the magnetic head with respect to a track center position of the servo data is recorded and on which a single burst recording pattern which is a layout pattern that tilts to the preamble recording pattern with a predetermined tilt angle is formed by a plurality of magnetic sections, the reproducing unit including a phase detection unit that detects a phase difference of a burst reproduced signal of the burst area from a reproduced signal of the preamble area, based upon sample values at respective points in the preamble area, which are sampled by using a synchronous clock determined by a reproduced signal processing of the preamble area and a plurality of predetermined coefficients, as phase difference information corresponding to a plurality of phase differences; and a position detection unit that detects position deviation information indicating a relative distance of the magnetic head from the track center position based upon the phase difference information; and a speed detection unit that detects a frequency fluctuation with respect to the reproduced signal of the preamble area of the burst reproduced signal, and detects a shifting speed of the magnetic head in a radial direction of the magnetic recording medium based upon the detected frequency fluctuation.