MULTI-STACK OPTICAL DATA STORAGE MEDIUM AND USE OF SUCH MEDIUM

摘要

A description is given of multi-stack optical data storage medium (20) for rewritable recording by means of a focused laser-light beam (30), said medium (20) having a substrate (1) with deposited on a side thereof: a first recording slick (2) comprising a phase-change type recording layer (6)- at least one further recording stack (3) comprising a phase-change type recording layer (12),- a transparent spacer layer (9) adjacent each further recording stack (3). The further recording stack (3) is sufficiently transmissive to ensure proper sensitivity for reading and recording in the first recording stack (2). For this purpose, at least one heat sink layer (10) made of HfNx, and 1.1=x=1.6, is present in at least one of the recording stacks (3). The heat sink layer (10) further ensure proper cooling behavior of the recording layer (12) of the further recording stack (3) in order to obtain sufficient recording performance in the further recording stack (3).