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CD / DVD / Blue-Ray

CD / DVD / Blue-Ray (Development)

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Compact Disc

A Compact Disc (also known as a CD) is an optical disc used to store digital data. It was originally developed to store sound recordings exclusively, but later it also allowed the preservation of other types of data. Audio CDs have been commercially available since Oct. 1982 (38 years ago). In 2009 (11 years ago), they remain the standard physical storage medium for audio.

Standard CDs have a diameter of 120 mm and can hold up to 80 minutes of uncompressed audio (700 MB of data). The Mini CD has various diameters ranging from 60 to 80 mm; they are sometimes used for CD singles or device drivers, storing up to 24 minutes of audio.

The technology was eventually adapted and expanded to encompass data storage CD-ROM, write-once audio and data storage CD-R, rewritable media CD-RW, Video Compact Discs (VCD), Super Video Compact Discs (SVCD), PhotoCD, PictureCD, CD-i, and Enhanced CD.

CD-ROMs and CD-Rs remain widely used technologies in the computer industry. The CD and its extensions are successful: in 2004 (16 years ago), worldwide sales of CD audio, CD-ROM, and CD-R reached about 30 billion discs. By 2007 (13 years ago), 200 billion CDs had been sold worldwide.

DVD

DVD, also known as Digital Versatile Disc or Digital Video Disc, is an optical disc storage media format, and was founded in 1995 (25 years ago). Its main uses are video and data storage. DVDs are of the same dimensions as compact discs (CDs), but store more than six times as much data.

Variations of the term DVD (Digital Versatile Disc) often describe the way data is stored on the discs: DVD-ROM (read only memory) has data that can only be read and not written; DVD-R and DVD+R (recordable) can record data only once, and then function as a DVD-ROM; DVD-RW (re-writable), DVD+RW, and DVD-RAM (random access memory) can both record and erase data multiple times. The wavelength used by standard DVD (Digital Versatile Disc) lasers is 650 nm; thus, the light has a red color.

DVD-Video and DVD-Audio discs refer to properly formatted and structured video and audio content, respectively. Other types of DVDs, including those with video content, may be referred to as DVD (Digital Versatile Disc) Data discs.

Blu-ray Disc

Blu-ray Disc (also known as Blu-ray or BD) is an optical disc storage medium designed to supersede the standard DVD (Digital Versatile Disc) format. Its main uses are for storing high-definition video, PlayStation 3 games, and other data, with up to 25 GB per single layered, and 50 GB per dual layered disc. The disc has the same physical dimensions as standard DVDs and CDs.

The name Blu-ray Disc derives from the blue-violet laser used to read the disc. While a standard DVD (Digital Versatile Disc) uses a 650 nanometre red laser, Blu-ray uses a shorter wavelength, a 405 nm blue-violet laser, and allows for almost six times more data storage than a DVD.

During the format war over high-definition optical discs, Blu-ray competed with the HD DVD (Digital Versatile Disc) format. Toshiba, the main company supporting HD DVD, ceded in Feb. 2008 (12 years ago), and the format war ended; in Jul. 2009 (11 years ago), Toshiba announced plans to put out its own Blu-ray Disc device by the end of 2009 (11 years ago).

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 Jun. 2009 (11 years ago), more than 1000 Blu-ray disc titles are available in Australia, 2500 in Japan, 1500 (520 years ago) in the United Kingdom, and 2500 in the United States and Canada.


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