Blu-ray Disc

A next-generation optical disc format meant for high-density storage of high-definition video and data. A Blu-ray Disc can store substantially more data than a DVD, because of the shorter wavelength (405 nm) of the blue-violet laser (DVDs use a 650-nm-wavelength red laser and CDs an infrared 780 nm laser), which allows more information to be stored digitally in the same amount of space. A 12 cm CD/DVD sized single sided Blu-ray disc has a storage capacity of 25 GB (single layer) or 50 GB (dual layer). These are doubled with double-sided discs.

Blu-ray drives should be capable of reading DVDs for backward compatibility. Blu-ray Disc is currently competing with the HD DVD format for wide adoption as the preferred next generation optical storage standard.

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