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Blue-ray Disc

Blu-ray Disc is a next-generation optical disc format meant for high definition video (HD) and high density data storage, and is one of two competing standards for HD optical media. Its competitor is HD-DVD. Blu-ray gets its name from the shorter wavelength (405 nm) blue laser that, in addition to other techniques, allows it to store substantially more data on the same sized disc than DVD, which uses a longer wavelength (650 nm) red laser. Blu-ray was jointly developed by a group of leading consumer electronics and PC companies called the Blu-ray Disc Association (BDA), which succeeded the Blu-ray Disc Founders (BDF).
One single-layer Blu-ray Disc (BD) can hold about 25 GB or over two hours of HD video plus audio, and the dual-layer disc can hold approximately 50 GB.

Related Topics:
HD-DVD
DVD

CD-ROM

References:
http://en.wikipedia.org/wiki/Blu-ray_Disc
http://www.bluraydisc.com/
http://www.blu-ray.com/