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|---|---|
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| Media type | High-density optical disc |
| Encoding | MPEG-2, H.264/MPEG-4 AVC, and VC-1 |
| Capacity | 25 GB (single-layer) 50 GB (dual-layer) 100/128 GB (BDXL) |
| Block size | 64 kb ECC |
| Read mechanism | 405 nm laser: 1× @ 36 Mbit/s (4.5 MByte/s) |
| Developed by | Blu-ray Disc Association[1] |
| Usage | Future possibility:Quad HD 2160p Ultra HD |
Blu-ray Disc (official abbreviation BD, erroneously also known as BR or Blu-ray) is an optical disc storage medium designed to supersede the standard DVD format. Its main uses are for storing high-definition video, PlayStation 3 video games, and other data, with up to 25 GB per single-layered, and 50 GB per dual-layered disc. Although these numbers represent the standard storage for Blu-ray Disc drives, the specification is open-ended, with the upper theoretical storage limit left unclear. 200 GB discs are available, and 100 GB discs are readable without extra equipment or modified firmware.[citation needed] The discs have the same physical dimensions as standard DVDs and CDs.
The name Blu-ray Disc derives from the "blue laser" used to read the disc. While a standard DVD uses a 650 nanometer red laser, Blu-ray Disc uses a shorter wavelength 405 nm laser, and allows for almost ten times more data storage than a DVD. While this laser color is called "blue," it is actually violet (purple) to the eye, and is very close to ultraviolet ("blacklight").
During the high definition optical disc format war, Blu-ray Disc competed with the HD DVDformat. Toshiba, the main company that supported HD DVD, conceded in February 2008, and the format war came to an end.[2] In late 2009, Toshiba released its own Blu-ray Disc player.[3]
Blu-ray Disc was developed by the Blu-ray Disc Association, a group representing makers of consumer electronics, computer hardware, and motion pictures. As of June 2009, more than 1,500 Blu-ray Disc titles are available in Australia and the United Kingdom, with 2,500 in Japan, the United States and Canada.[4][5]
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