| 摘要 |
PROBLEM TO BE SOLVED: To make switchable the polarity of a tracking at a proper position by outputting an encode pulse according to rotating of a rotation means, counting the number of encode pulses outputted from a regenerative output of a header part and judging as a recording area of a next sector when a count value becomes a prescribed value for the recording areas of plural sectors. SOLUTION: When the data are recorded, or the recorded data are reproduced continuously over plural sectors, the number of sectors are supplied to a CPU 25, and a spindle motor is rotated at the number of revolution corresponding to the number of sectors, and an optical pickup 2 is moved to a corresponding track. Simultaneously, the number of pulses of an encoder 10a according to a sector interval decided by the number of sectors are set in a counter circuit. When the count value becomes the prescribed value. Even when an address part of the header of the next sector is not reproduced, the recording can be performed in the storage area of the sector based on the count value, and the position of the storage area can be judged.
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