| 摘要 |
PURPOSE:To improve reliability at the time of checking of data recording and read-out just after the recording, by two optical disk heads. CONSTITUTION:After an ID part 3 of a sector S is read out by a preceding optical head H1, recording is started into a data part 4 and just after it, the ID part 3 of the sector S is read and checked by a back optical head H2 and then the read-out of a data part 4 is checked. Thus a data recording is processed while confirming that two optical heads are positioned on the same track. |
