| 摘要 |
An optical disk apparatus has a highly accurate trial writing function corresponding to a PRML system and copes with a bad jitter of a 2 Tw mark in order to realize an optical disk, the recording/reproduction of which is enabled in both a DVD and a Blu-ray Disc by a drive. After a reproducing signal is A/D-converted, error pulse generation is enabled corresponding to the PRML by detecting an edge signal level, and an error pulse is generated when the level exceeds a threshold. At the same time, trial writing that corresponds to the difference in the jitter of the 2 Tw mark and a mark of 3 Tw or more is enabled by providing multiple error pulse thresholds.
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