| 摘要 |
A method and apparatus for positioning a transducer relative to a storage medium in a storage device. The storage medium is moved relative to the transducer by a motor at a rated storage medium velocity. The storage medium has a plurality of tracks, each having a first edge and a second edge. The first edge and the second edge respectively comprise surface profile variations having a temporal frequency at the rated storage medium velocity. The surface profile variations of the first and second edges are phase modulated, i.e., have a phase difference relative to one another. First and second responses, e.g., thermal responses, are respectively induced in the transducer by the phase modulated surface profile variations of the first and second edges. The transducer may be positioned by a controller, for example, based on at least one of the first and second thermal responses. A storage medium having phase modulated surface profile variations is relatively easy to fabricate. Moreover, relatively simple servo electronics can be used with the phase modulated surface profile variations.
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