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Blu-ray Disc is an opticaldisc storage media format and is used like its predecessors (CDR and DVD) for storing data and video.

The name Blu-ray is derived from the blue laser used in the machine. Because of its shorter wavelength (405 nm), more data can be stored on a Blu-ray Disc than on a DVD which uses a red (650 nm) laser.

As with Betamax and VHS, Blu ray has beaten its competitor HD DVD, which was launched at a similar date.

Because the Blu-ray Disc data layer is closer to the surface of the disc, compared to a DVD, they were housed in cartridges for protection. They no longer have cartridges due to the advances in polymer technology.