Abstract

The capability of an optical disk drive to randomly access the recording surface of a disk to record or play back data depends on the presence of radial and circumferential position information on the disk. The arrangement of this positional information and the data fields is commonly referred to as the disk format, and two basic methods of putting the positional information on a disk appear to predominate. These are; phase information impressed in the substrate (pregrooving) and optically prerecorded contrast or phase information (servowriting).

© 1983 Optical Society of America