REWRITABLE OPTICAL INFORMATION MEDIUM

摘要

A rewritable single-sided double layer optical information medium having a first recording stack with a phase change recording layer sandwiched between two dielectric layers. The recording stack is sufficiently transmissive to ensure proper reading/writing of the second recording stack. For this purpose, the recording stack includes a thin metal layer and a further dielectric layer. The laser beam can be focused on the first recording stack or on the second recording stack, thus doubling the storage capacity of the recording medium.