Recording apparatus, recording medium, reading apparatus, and recording medium determination method

摘要

When a unique ID (identification information) is recorded on a loaded disk, the unique ID is recorded in a state in which the write clock is made to be 1/N so that the unique ID is recorded at a line density differing from that of another piece of information. Alternatively, as for writing control when recording a unique ID, the number of rotations of a disk is made to be N times greater. During reading, the unique ID is read by making the clock to be 1/N or by making the number of rotations of the disk to be N times, and the type of disk is determined on the basis of whether or not the unique ID could be read.