| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly portable and convenient optical recording medium. SOLUTION: A CD card 1 is provided with an optically readable recording area formed on one side of a flat board surrounded with an edge including at least a pair of parallel lines. The recording area is provided with a read only area 13 having prerecorded data, and a DRAW type area 14 on which new data can be additionally written, which are disposed concentric-circularly. A supporting part 12 is formed at a rotational center and, by rotary-driving the CD card 1 around the supporting part 12, data is read, and additionally written. |
