Patent ID: 8389094

Claim:
A method of forming an optical data storage medium, comprising: (a) providing a first freestanding workpiece, the first workpiece comprising a front surface and a back surface, at least one of the first workpiece front surface and back surface having a first data layer comprising a plurality of data pits; (b) forming a first reflective layer in proximity to the first data layer; (c) providing a second freestanding workpiece, the second workpiece comprising a front surface and a back surface, at least one of the second workpiece front surface and back surface having a second data layer comprising a plurality of data pits; (d) forming a second reflective layer in proximity to the second data layer; (e) providing a polymeric layer over the first workpiece; (f) pressing a mold into the polymeric layer to form a third data layer in the polymeric layer, wherein the third data layer comprises a plurality of data pits having a minimum pit length of 0.25 μm or less; (g) separating the mold from the polymeric layer; (h) forming a third reflective layer in proximity to the third data layer; and (i) attaching the first workpiece to the second workpiece; wherein the providing the polymeric layer comprises forming a curable layer over the first workpiece and curing the curable layer with photonic and/or thermal energy prior to pressing the mold into the polymeric layer.