Optical recording medium with write-once and rewritable properties

摘要

A write-once optical recording medium is described, which in addition to the write-once properties also has rewritable properties. The optical recording medium has a recording layer with at least a first recording sublayer and a second recording sublayer for recording information marks by alloying material of the at least first and second recording layers. The materials of the at least first and second recording sublayers are chosen such that the alloyed material is a phase-change material adapted for recording additional data as phase changes of the alloyed material.