DISK FOR EXAMINATION

摘要

PROBLEM TO BE SOLVED: To provide a disk for examination with which the data of plural fault pattern parts can be read only by once rotating a disk and time required for confirming a reproducing ability in respect to all fault patterns can be remarkably shortened. SOLUTION: Concerning the disk for examination having concentric data tracks 6 on a disk 8 for reading data stored on these data tracks 6, plural fault patterns 1, 2 and 3 are located on single or respective plural data tracks 6 on the disk 8.