| 摘要 |
PROBLEM TO BE SOLVED: To suppress the maximum eccentric amount of centers of data areas on disk substrates stuck each other to be smaller than the maximum allowable value in the specified dimension by making to coincide the centers of each data area on the double-sided optical disk substrate. SOLUTION: In this double-side optical disk 11, by fitting a center hole 12a of the low side disk substrate 12 to the outer periphery of a tapered surface 32a of a truncated cone shaped centering hub 32 on a disk table 31 in a disk drive, the disk 11 is horizontally mounted on the table 31 in such a manner that a center S11 of the center hole 12a is positioned to a center S13 of the disk table 31. The center D12 of the data area 17 on the disk substrate 13 is accurately made to coincide beforehand with the center S11 of the center hole 12a on the disk substrate 12. |
