Patent ID: 7935403

Claim:
A master substrate comprising a substrate layer and a recording stack deposited on the substrate layer, the recording stack comprising: an information layer, said first information layer comprising a growth-dominated phase-change material for forming marks and spaces representing an encoded data pattern, a first interface layer sandwiched between said information layer and the substrate, wherein said recording material is an alloy comprising at least two materials of the group of materials containing Ge, Sb, Te, In, Se, Bi, Ag, Ga, Sn, Pb, As, and a second interface layer acting as a barrier to etching, said second interface layer being sandwiched between said information layer and the substrate, wherein the recording stack further comprises a protection layer adjacent the information layer at a side most remote from the substrate wherein said protection layer comprises an organic material, and a metal heat sink layer sandwiched between said substrate layer and said first interface layer or second interface layer.