Reversible phase change optical recording material with a new quartenary system of Ag-In-Sb-Te, having high sensitivity and high erasability, has been developed. Furthemore, applying the Ag-In-Sb-Te system to rewritable compact disc (CD-ReWritable; CD-RW), high performance comforming to Orange Book Part III which is the CD-RW standard was achieaved for the first time in the world.
