| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a user to surely recognize a record surface of a disk format from which the user desires to read. <P>SOLUTION: A hybrid type optical disk medium 1 has data recording surfaces on both sides, and one side of them is a first recording surface 2, and the other side is a second record surface 3. In an area outer side of a disk clamp area on the disk surface of the first record surface 2, a first label 6 indicated as "HDDVD", "NO DVD" so as to identify a disk format of the second record surface 3 is attached detachably, and in an area outer side of a disk clamp area on the disk surface of the second record surface 3, a second label 7 indicated as "DVD", "NO HDDVD" so as to identify a disk format of the first record surface 2 is attached detachably. <P>COPYRIGHT: (C)2007,JPO&INPIT |
