| 摘要 |
PROBLEM TO BE SOLVED: To increase memory capacity and to obtain an information recording medium which corresponds to plural numbers of media by forming such a multilayered structure in the information recording medium that information can be recorded into first to N-th layers and by making different formats for respective layers. SOLUTION: The information recording medium 1 has a three-layer medium in which information is recorded in a first layer A1, second layer B1 and third layer C1. The tracks in the first layer A1 are formed in a 512-byte format sector size, the tracks in the second layer B1 are formed in a 1024-byte format sector size, and the tracks in the third layer C1 are formed in a 2048-byte format sector size. Thereby, the memory capacity can be increased by forming a three-layer information recording medium 1. By making different formats for respective layers, one sheet of the information recording medium 1 has a function corresponding to three sheets of media. |
