Patent ID: 7427466

Claim:
A data storage disk master comprising: A disk-shaped glass substrate layer; and a multi-layer structure deposited adjacent the disk-shaped glass substrate layer, the multi-layer structure including an etch-stop layer of a first thickness, an etch layer of a second thickness, and a photoresist layer of a third thickness, wherein the second thickness associated with the etch layer comprises a fixed thickness approximately equal to a final feature depth of the master, and wherein the first thickness and the third thickness are chosen such that the first, second, and third thicknesses generate reflectivity less than approximately four percent of the incident light for at least one interface of the photoresist layer of the multi-layer structure wherein the at least one interface is one or both of an interface of the photoresist layer and the surrounding air or an interface of the etch layer and the photoresist layer and wherein the photoresist layer defines a contact mask and the etch layer is etched through the contact mask to define a feature of the master in the etch layer.