| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a read-only medium capable of dealing with two specifications of recording and reading systems different from each other and reading recorded data by reading means based on either specifications. <P>SOLUTION: The disk-shaped read-only medium has an HD substrate 10 having a prescribed thickness (0.6 mm) based on an HD specification, a recording layer 20 and a BD substrate 30 formed on the side opposed to the HD substrate 10 via the recording layer 20 and having a prescribed thickness (0.1 mm) based on a BD specification. <P>COPYRIGHT: (C)2009,JPO&INPIT |
