| 摘要 |
In a single-sided multi-layer optical disk, "n" information layers are formed so that sector address portions ( 9, 11 ) do not overlap with each other in a stack direction in a combination of adjacent information layers ( 1, 4 ) and an optical separating layer ( 3 ) is disposed between the information layers. Thereby, signals of the sector address portion can be reproduced stably without being affected by the sector address portions of the adjacent information layer(s).
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