1. An optical disk, comprising: a substrate having a circular first surface and an opposing circular second surface, wherein the outer diameter of the first and second surface is approximately less than 50 mm; a spiral pattern of bumps on a first portion of the circular first surface, wherein information is stored on and read from the bumps; a spiral land on a second portion of the circular first surface, wherein information is written to and read from the land; and a continuous multi-layer optical coating overlaying the bumps and land on the circular first surface, wherein the optical coating comprises: a metal/alloy layer comprising tin, antimony and an element selected from the group consisting of indium, germanium, aluminum, and zinc; and a dielectric layer overlaying the metal/alloy layer.