Optical data medium containing, in the information layer, a dye as a light-absorbing compoundA b s t r a c tOptical data medium containing a preferably transparent substrate which is optionally already coated with one or more barrier layers and on the surface of which an information layer which can be recorded on using light, optionally one or more barrier layers, and a cover layer containing a radiation-cured resin, have been applied, which data medium can be recorded on and read using focused blue light through the cover layer on the information layer, preferably laser light with the wavelength between 360 nm and 460 nm, the information layer containing a light-absorbing characterized in that at least one dye is used as the light-absorbing compound wherein the cover layer does have a total thickness of 10 µm to 177 (m and the numerical aperture NA of the focusing objective lens setup is greater or equal 0.8.