Blu-ray disc is also belongs to the family of digital optical disc data storage format, came into market to replace existing DVD format. Its size is almost similar as DVD and CD i.e. 120 mm in diameter and 1.2 m thick and its capacity compared to DVD is more i.e. 25 GB per layer, and other discs are available in size of 50, 100 and 125 GB.
In DVD, red laser is used to read disc but in Blu-ray disc, blue laser is used to read data stored on it and it allows data to be stored in huge abundant compared to DVD. Majorly, these Blu-ray disc are used as medium for storing video films and it is basically associated with multimedia formats which allows audio and video to be stored with higher definition. Blu-ray Disc Assocaition, a group representing makers of consumer electronics, motion picture and computer hardware were developed blu-ray disc format. Its first prototype was announced publically in October 2000 and released a first prototype player in April 2003 in Japan.
Blu-ray disc formats planned
There is also plan for a BD/DVD hybrid format, which combines Blu-ray and DVD on the sane disc so that it can be played in both blu-ray players and DVD players.