Designed to supersede the digital videodisc standard format or DVD, the blu-ray disc is primarily a highly reliable optical disc storage device. People commonly use it for storing PlayStation 3 games, high definition videos and other important data. Single-layered discs have a capacity of up to 25GB. On the other hand, dual-layered discs can store up to 50GB. Aside from these highly valuable details, it is also good to know the other significant aspects of this optical disc storage including the dimensions of a blu-ray disc.
Just like the other optical discs, a blu-ray disc has a diameter that ranges from 3 to 12 inches or 7.6 to 30 centimeters. The most common size is 4.75 inches or 12 centimeters. In terms of thickness, each disc measures approximately 0.05 inches or 1.2 millimeters. It shares the same physical dimensions with standard CDs and DVDs. Aside from the standard version, there is also a mini blu-ray disc. It has a compact design, with a diameter of only 3-inches or 8 centimeters. Aside from its physical aspects, it also boasts of improved video data compression codecs as well as enhanced multimedia presentation capacity.
The term ‘blu-ray’ comes from the blue-violet laser, which is primarily used to read blu-ray discs. Unlike a standard DVD, this one makes use of a shorter wavelength. Aside from its 405 nm blue-violet laser, many people prefer this product because it offers them more data storage, which is said to be six times than what standard DVDs offer.
The Blu-ray Disc Association is the main force behind the development of blu-ray discs. This particular group represents makers of motion pictures, computer hardware and consumer electronics. By June 2009, there were already 2,500 blu-ray disc titles available in the United States, 1,500 in the United Kingdom and 1,000 in Australia. In Japan, more or less 2,500 titles were released.
The physical specifications of the blu-ray disc were finalized some time in 2004. In June 2006, manufacturers released the very first set of blu-ray disc titles. In order to read and write different kinds of data, a blue-violet laser is used, which operates at a 405 nm wavelength. According to experts, this is better than the red as well as near-infrared lasers that are used in conventional CDs and DVDs. The shorter wavelength of the blue-violet laser allows a CD/DVD-size disc, which only measures 12 centimeters, to store more information.