How it works A single layer disc of the new format contains three times more information than the layer dvd. On single-layer disc can accommodate up to 15 gigabytes of data on two levels – up to 30. The developer was represented by a three-layer version of hd dvd with a total capacity of up to 51 gigabytes. The capacity of each layer in the latter case was increased to 17 gb, although compatibility with players, released until 2007, is not guaranteed. As a file system can be used with iso 9660 or udf version 2.5. It supports all video formats: from low-quality cif (352×288) and standard sdtv (720×576) to all types of hdtv (1280×720, 1920×1080), coded as in distributed by MPEG2, and in the new VC-1 and avc.
Sound – 2 channel 24bit/192kGts to 8 channels of 24-bit/ encoded in pcm, dts, Dolby Digital ex, and Dolby True hd. Maintained and additional audio track – in formats DTS-HD High Resolution Audio or DTS-HD Master Audio. In drives using blue-violet laser with a wavelength of 405 nm, numerical aperture is much lower than in the blu-ray (0,85), slightly higher than the dvd (0,6) and equals 0.65. The protective layer is the same as in the dvd – 0,6 mm. It is this increased thickness of the protective layer has led to the fact that each information layer of this format contains less information than the layers of blu-ray discs – through such a thickness is impossible to focus the laser beam so as compact as a competing technology.