Patent ID: 7914711

Claim:
A method of making a first-surface optical disk, comprising: providing a father stamper, wherein the father stamper comprises spiral protrusions on a first portion of a first surface and bumps on a second portion of the first surface, the spiral protrusions and bumps corresponding to original laser cuts; coating the first surface of the father stamper with nickel; separating the nickel from the first surface to produce a second stamper having groove recesses and pits on a first surface, wherein the groove recesses are mirror images of the spiral protrusions and the pits are mirror images of the bumps; covering the first surface of the second stamper with a plastic material; separating the plastic material from the second stamper, wherein the plastic material has lands corresponding to the groove recesses of the second stamper and bumps corresponding to the pits; depositing a phase-change material directly over the lands and bumps, wherein the phase-change material is in a first state upon deposition and in a second state after being written to, and wherein the change from the first state to the second state changes the optical phase of the phase-change material in the positive direction, the lands forming a writeable area of the first-surface disk and the bumps forming a read-only area of the first-surface disk; and depositing a dielectric layer over the phase-change material to form the first-surface optical disk, the dielectric layer being deposited to have a thickness that enhances an optical phase difference between the first and second states of the phase-change material, the first-surface optical disk consisting of no further layers.