Blu-ray, also known as Blu-ray Disc

Blu-ray, also known as Blu-ray Disc (BD) is the name of a next-generation optical disc format jointly developed by the Blu-ray Disc Association (BDA), a group of leading consumer electronics and PC companies (including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson). The format was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. A single-layer Blu-ray …

…Forum as a possible successor to the current DVD technology. 3.2 What's the difference between Blu-ray and HD-DVD? Parameters BD BD HD-DVD HD-DVD Storage capacity 25GB 50GB 15GB 30GB Number of layers single-layer dual-layer single-layer dual-layer Laser wavelength 405nm 405nm 405nm 405nm Numerical aperture (NA) 0.85 0.85 0.65 0.65 Protection layer 0.1mm 0.1mm 0.6mm 0.6mm Data transfer rate 54.0Mbps 54.0Mbps 36.5Mbps 36.5Mbps Video compression MPEG-2 MPEG-4 AVC VC-1 MPEG-2 MPEG-4 AVC VC-1 MPEG-2 MPEG-4 AVC VC-1 MPEG-2 MPEG-4 AVC VC-1