| 摘要 |
A method and apparatus for recording and reading both permanently stored information (4) and user-supplied information (2) on an optical disk (Fig. 1) are disclosed. The optical disk (Fig. 3) is provided with permanent information via pits (102a, 102b) in a substrate (100) of the disk. User-supplied information (112a, 112b) is recorded in an expansion/retention layer (104) adjacent the substrate (100). The permanent (4, 102a, 102b) and user-supplied information (2, 112a, 112b) may be read via laser beams having unequal wavelengths. |
