| 摘要 |
A disk-shaped magnetic recording medium (1) having a reference track and plural data tracks is rotated by a spindle motor (2) which generates an index signal at a predetermined position. A magnetic head (5) is slightly moved in the direction of the radius of the medium for each predetermined unit distance smaller than the data track width, and a reproduction output amplitude measuring circuit (6) measures the reproduction output amplitude of a signal read from the data track for each index signal. A CPU (8) obtains a position where the reproduction output amplitude has the maximum value on the basis of the number of head movements and the reproduction output amplitude at that time so as to control data track positioning. Further, the CPU (8) calculates a relative position between the data track position and the reference track position so as to perform reference track positioning. Thereby, the data track positioning or reference track positioning of the magnetic head (5) can be performed accurately, in a short time.
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