Blu - Ray

Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage medium designed by Sony to supersede the standard VD format. Its main uses are higt-definitin video and data storage with 50GB per disc. The disc has the same physical dimensions as standard DVDs and CDs.
The name Blu-ray Disc is derived from the blue laser (violet-colored) used to read and write to this type of disc. In part because of the shorter wavlength (405 nanometres), substantially more data (almost 6 times more) can be stored on a Blu-ray Disc than on a standard DVD, which uses a red (650 nm) laser.
During the format war over higt-definition optical discs, Blu-ray Disc competed with the HD DVD format. In February 2008, oxhiba —the main company supporting HD DVD— ceded and effectively ended the format war.
Blu-ray Disc is developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures. As of January 2009, more than 890 Blu-ray disc titles are available in Australia, 720 in Japan, 1,140 in the United Kingdom, and 1,500 in the United States.