Blu-ray, also referred to as Bluray Disc (BD), is the name of a next-generation optical disc format. It has the same physical dimensions as standard DVDs and CDs, however offers over five times the storage capacity of conventional DVDs, holding up to 27 GB of data on a single-layer disc (that’s more than 2 hours of high definition video or about thirteen hours of standard video) and up to 50 GB on a dual-layer disc. Latest developments by Pioneer have pushed the storage capacity to 500GB on a single disc by using 20 layers. It is this kind of development that means the latest pioneer blu-ray player models are considered by many to be the best available.
This extra capacity combined with the use of state-of-the-art video and audio codecs gives consumers an unprecedented high definition experience. In addition, extras such as bonus material and special features can be included in high quality on the same disc, so there is no need for separate bonus discs to accompany the film title.
Blu-ray was jointly developed by the Bluray Disc Association (BDA), a collection of the world’s top consumer electronics, personal computer and media manufacturers (including Dell, Apple, HP, Hitachi, JVC, Mitsubishi, Pioneer, LG, Panasonic, Philips, Sony, Samsung, Sharp, Thomson and TDK). It has been developed to allow recording, rewriting and playback of high definition video (HD), in addition to storing huge amounts of data.
Whilst present optical disc technologies like DVD make use of a red laser to read and write data, the Bluray format uses a blue-violet laser in its place. The benefit of using a blue-violet laser (405 nm) is that it has a shorter wavelength than a red laser (650 nm), which makes it possible to focus the laser spot with even greater accuracy. This enables data to be packed more tightly and stored in a reduced amount of space, so it’s possible to fit a lot more data on the disc. Nonetheless, despite the different kind of lasers used, Bluray products can easily be made backwards compatible with CDs and DVDs via the use of a BD/DVD/CD compatible optical pickup device.
During the format battle over high definition optical discs, Blu-ray Disc competed with the HD DVD format. Nevertheless, on February 19, 2008, Toshiba (the main company supporting HD DVD) announced that it would no longer develop, manufacture, or market HD DVD players and recorders, leading almost all other HD DVD companies to follow suit, and thus effectively ending the format war. Blu -ray is presently supported by about 200 of the world’s leading personal computer, consumer electronics, recording media, music and video game companies. The format also has support from all Hollywood studios and other smaller studios as a successor to the current DVD format. Major blank media manufacturers such as TDK also support the Bluray Disc format as the successor to DVD.
Blu-ray provides some of the strongest copy protection methods ever developed for any consumer format, which makes it the best option for any content publisher wanting assurance that their valuable assets are guarded from piracy. The format incorporates a powerful copy protection mechanism, which not only relies on implementation on the playback device, but which also includes precautions at replicator level, which can be strictly controlled. Unlike the voluntary implementation of CSS protection in DVD, the copy protection mechanism for Bluray Disc is mandatory and will be governed by strict licensing procedures.
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