Experimental estimation of an optical disk system with V-shaped grooves

A new high-density optical disk system has been investigated experimentally. In this system, the optical disk has grooves with a V-shaped cross-sectional configuration. The V-shaped grooves are spaced bottom to bottom by the presently used track pitch, and all walls of the grooves are capable of storing information. The cross talk from information on an adjacent wall has been determined to be almost equal to that of the presently used optical disk, and the new system is verified to double the information density of the optical disk.