Patent ID: 7972673

Claim:
An optical recording medium, comprising: a substrate including main data by a combination of pits and lands recorded on said substrate; a reflective film formed on the substrate and capable of recording using a laser light, said reflective film having a first reflectance and including a plurality of marks formed into the reflective film by the irradiation of the laser light for recording with respect to said reflective film, the plurality of marks representing sub data and having a second reflectance that is higher than the first reflectance; and a cover layer formed on the reflective film, wherein reproducing signal levels at portions where said marks are formed increase for said land of specified length, wherein the reproducing signal levels decrease at the portions where said marks are formed for an optical disc recording medium that is manufactured by physically copying a surface-shape of said pits and lands of said substrate, wherein the plurality of marks are at said pits and said lands, and each mark at a respective land is at a center portion of the respective land, wherein said reflective film is made by an Ag-alloy film of Ag 100-x X x , where 0<x<100, and wherein said X is an element of at least one of titanium, tungsten, tantalum, vanadium, molybdenum, niobium and zirconium.