LASER WRITABLE RECORDING BLANK

摘要

PROBLEM TO BE SOLVED: To provide a comprehensive system for writing information on an inexpensive rotary medium similar to the conventional CD-ROM technology. SOLUTION: A laser writable information storing blank includes a substantially plane disk consisting of a material allowed to be changed by the irradiation of a laser beam. The blank medium preferably includes a spiral pattern type metallic track pattern 34. The track pattern 34 provides two reference edges 37 and an accurate distance for reading out/writing binary information stored between adjacent track parts is determined from these edges 37.