| 摘要 |
The present invention relates to an optical compact disc, on which data in a binary digital format are physically memorized as pits and lands of the disc surface along a spiral-shaped track running all along the surface of the disc. The track is scanned, during the data reading phase by the reading optical apparatus with a constant linear velocity (CLV). The track has at least one of first and second portions. The first portion of the track is scanned, during the data reading phase, with a CLV of between about 0.1 m/s and 1.2 m/s. The second portion of the track comprises a constant track pitch of between about 1.3 mum and 1.6 mum.
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