Patent ID: 7838067

Claim:
A method for producing an information-storage media disk having first and second interface layers, a first information storage layer on a first side of a substrate disk, and a second information storage layer on second side of the substrate disk, comprising: depositing the first interface layer on the first side of a substrate disk and the second interface layer on the second side of said substrate disk, respectively, wherein the first and second interface layers have differing chemical compositions, and wherein the first and second interface layers cause the substrate disk to be curved; controlling curvature of the disk by removing unequal thicknesses from the first and second interface layers, wherein, after the removal step, the first and second interface layers remain, the thickness of the first interface layer being less than the thickness of the second interface layer and the flatness of the first and second sides is from 2 to 10 microns; subsequently depositing the first information storage layer on the first interface layer and the second information storage layer on the second interface layer; and controlling curvature of the information-storage media by forming the information-storage layers and the first and second interface layers to provide the information-storage media.