17-08-2012, 02:00 PM
Network Economics
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Blue-ray disc
A Blu-ray Disc (also
called BD) is a
high-density
optical disc
format for the
storage of digital
information,
including
high-definition video.
History
The name Blu-ray Disc is derived from the blue-violet laser used to read and write this type of disc. Because of its shorter wavelength (405 nm), substantially more data can be stored on a Blu-ray Disc than on the DVD format, which uses a red (650 nm) laser. A single layer Blu-ray Disc can store 25 gigabytes (GB), over five times the size of a single layer DVD at 4.7 GB. A dual layer Blu-ray Disc can store 50 GB, almost 6 times the size of a dual layer DVD at 8.5 GB.
Blu-ray was developed by the Blu-ray Disc Association, a group of leading companies representing consumer electronics, computer hardware, and motion picture production. The standard is covered by several patents belonging to different companies. As of March 2007, a joint licensing agreement for all the relevant patents has not yet been finalized.[1]
As of October 23, 2007, 351[2] titles have been released on Blu-ray Disc in the United States (32 of those titles have since been discontinued). As of October 9, 2007, 179 titles have been released in Japan, with 55 titles planned for release.[3]
The Blu-ray standard is currently in a format war with its rival HD DVD, to determine which (if either) of the two formats will become the leading carrier for high-definition content to consumers.
More History
Blu-ray Disc (BD) is a new, high-density optical disc that offers massively increased storage capacity. Sony is taking home entertainment to a higher level with Blu-ray Disc, enabling you to store vast quantities of the highest-quality data, video and sound on one of the most powerful, durable and sustainable formats ever.
Named after the blue-violet laser used to read the media, Blu-ray Disc stores up to 54 GB on a single disc. That’s six times greater capacity than conventional double-sided DVDs, making it perfect for high-definition TV (HDTV), full-length movies and countless interactive features.
You can count on plenty of top-quality content to take advantage of the format. BD technology has been developed by some of the world’s top consumer electronics, IT and media companies, including Sony, Panasonic, Philips, Sharp, Hitachi, Pioneer, Dell, HP, Samsung and TDK. And Twentieth Century Fox has recently become the first Hollywood studio to support this revolutionary new technology in addition to Sony Pictures Entertainment Company.
Blu-ray Disc is the most durable and sustainable optical disc yet – designed to last for decades, so lovers of quality can enjoy its possibilities for years to come. Plus, Sony and others have already developed single optical pickups to read data from CDs, DVDs and BDs all on a single device, for the complete optical recording and playback solution.