| 摘要 |
PURPOSE:To improve the recording reliability of information by securing such as constitution where the 2nd spot detects the correction of the information recording surface prior to the 1st spot when the 1st spot records the information and the 3rd spot following the 1st spot reproduces the information recorded by the 1st spot. CONSTITUTION:The 2nd spot 21 detects the state of a track 28 before the 1st spot 18 records the information on the track 28 and then detects an inadequate case where the information is already recorded. Thus a prescribed command is delivered from a check data reading circuit 27. Then a signal processing circuit 15 delivers a command to stop the recording action of information or to record the information another track 28. Then the information reproduced by the 3rd spot 22 is compared with the information held by the circuit 15 holding the preceding information by a track. Thus the correct or wrong recording of information is decided. |
