Blu-ray (not Blue-ray) also called Blu-ray Disc (BD), is a name associated with a next-generation optical disc format jointly created through the Blu-ray Disc Association (BDA), a collection of the world’s top consumer electronics, PC and media manufacturers (including Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, TDK and Thomson).
The format was produced to permit recording, rewriting and playback of high-definition video (HD), as wel as storing large amounts of data. This data format presents more than five times the storage capability of traditional DVDs and will hold around 25GB on a single-layer disc and 50GB on a dual-layer disc. This extra capacity combined with the use of sophisticated video and audio codecs offer customers an unprecedented HD experience.
While present optical disc technologies such as DVD, DVDR, DVDRW, and DVD-RAM rely on a red laser to read and write data, the new data format makes use of a blue-violet laser instead, hence the name Blu-ray. Despite the distinctive type of lasers utilised, A Blu ray disc player can conveniently be made backwards compatible with CDs and DVDs through the use of a BD/DVD/CD compatible optical pickup unit. The benefit of employing a blue-violet laser (405nm) is that they have a shorter wavelength compared to the red laser (650nm), which makes it possible to target the laser spot using even greater precision. This allows data to be packed much more tightly and also stored in less space, hence it is possible to fit a lot more data on the disc although it’s the same dimension as a CD/DVD.
This together with the change of numerical aperture to .85 is what enables Blu ray Dvds to hold 25GB/50GB. Recent development by Pioneer has pushed the storage capacity to 500GB on a single disc by applying 20 layers.
Blu-ray is presently supported by about 200 of the world’s leading consumer electronics, personal personal computer, recording media, game and also music companies. The format has the benefit of support from all Hollywood studios and countless smaller studios as a successor to today’s DVD format. Many studios have also proclaimed they will commence releasing new feature films on Blu ray Dvds as well as a continuous slate of catalog titles every month. .
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