New optical disc for-mat that can store 50GB on a dual-layer disc the size of a DVD. Competing with HD DVD to be the high-definition replacement for DVD.
Jointly developed by Philips and Sony, BD was the first "next-generation" DVD format to gain widespread industry support. Ultimately, the DVD Forum approved the rival HD-DVD format, proposed by Toshiba and NEC.
The newest disc format (developed by Sony, Matsushita and Philips) which can hold 23–30 GB of data per layer. This is equivalent to about four hours of high-definition video.