Disk-shaped record carrier.

摘要

A disk-shaped record carrier for an optical recording system has concentric information tracks (12). A plurality of preformatted clock locations (14, 16) prewritten into each of the concentric information tracks at equi-spaced intervals, information being written using a selected one or none of a predetermined plurality of possible writing locations (18, 20, 22) between each pair of clock locations, the particular location between clock locations being representative of the data.