| 摘要 |
PURPOSE:To execute high speed access having no reproducing access time loss by recording the identifying information of a track, whose recording has been impossible, in a retrieval area, and executing additional recording on an auto track (AT) and an auto focus (AF) without any adverse influence. CONSTITUTION:At the time of a forward motion of a card 2, main information of the respective tracks 3-1-3-4, etc. of a main storage area 11 is written, and at the time of a return motion, its information is read out and whether an error exists or not is checked, and a track identification number 102 of the track 3-3 whose recording has been impossible due to an error, etc. is stored in a memory. After recording of the main information has been ended, the identification number 102 of the track whose recording has been impossible, etc. are written on an area 17, etc. of a sub-area 13-2 on which other retrieval information of a directory 12 of a retrieval area is also written. According to them, an additional recording is executed for AT and AFT without any adverse influence, also only the recorded track is brought to reproducing access, and high speed access having no loss of access time is executed.
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