Do Blu-ray and HD DVD discs require a cartridge?
HD-DVD discs are similar to current DVDs in that the recording layer is sandwiched between two 0.6 millimeter layers of plastic in the middle of the disc. With the recording layer protected, HD DVD discs do not require a cartridge. To protect the cartridge-free BD media from scratches, fingerprints and dust particles which can cause recording and playback errors, Verbatim BD discs have the added protection of a cover layer and a proprietary hard-coat finish. Similar to the surface coating technology found in touch panel displays and the lenses of plastic glasses, the hybrid organic/inorganic coating technology developed by MKM protects the recording layer without warping the disc.
