Blu-ray also known as Blu-ray DISC(BD) is a name of a next generation optical disc video recording format jointly developed by nine leading consumer electronics companies(Hitachi,LG, Matsuhita (Panasonic), pioneer, philips, samsung,sharp, sony, and Thomson). The format was developed to enable recording, rewriting and play back of high definition video(HDTV). Blu-ray makes it possible to record over 2 hours of digital high definition video(HDTV) or more than 13 hours of standard-definition video(SDTV/VHS Quality) on a 27 GB disc. there are also plans for higher capacity discs that are expected to hold up to 50 gb of data. the nine companies announced the joint establishment of the specification for blu- ray disc in feburary 19 2002 and after the hard work of the professionals of those companies it is in the market from April 10, 2003. An interesting factor about the blu-ray is that in near future we can find the collection Blu-ray disc of movies in the market as we get the collection of MP3 files.
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