- published: 10 Jun 2015
- views: 18585
The Compact Disc (also known as a CD) is an optical disc used to store digital data. It was originally developed to store and play back sound recordings only, but the format was later adapted for storage of data (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. Audio CDs and audio CD players have been commercially available since October 1982.
Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to 80 minutes of uncompressed audio or 700 MB (700 × 220 bytes) of data. The Mini CD has various diameters ranging from 60 to 80 millimetres (2.4 to 3.1 in); they are sometimes used for CD singles, storing up to 24 minutes of audio or delivering device drivers.
CD-ROMs and CD-Rs remain widely used technologies in the computer industry. The CD and its extensions are successful: in 2004, worldwide sales of CD audio, CD-ROM, and CD-R reached about 30 billion discs. By 2007, 200 billion CDs had been sold worldwide. Compact Discs are increasingly being replaced or supplemented by other forms of digital distribution and storage, such as downloading and flash drives, with audio CD sales dropping nearly 50% from their peak in 2000.
that thing you're listening to is called a compact disc it's method of conveying sound it's square outside inside it's round that thing you're listening to is a digitally accurate reading of the numbers that make up different sounds in fact it's the most technologically advanced sound reproduction known to man at least in the commercially viable sense that thing you're listening to is called a compact disc every subtle nuance of a time is made available to you that thing you're listening to is a high tech dream come true technically it works with laser beams yet you can learn to use it easily throw your scratched, dusty records in the trash it's time to move out of the past in the profit analysis sense that thing you're listening to is called a waste of time an inferior and overpriced product of an underactive mind that thing you're listening to is a multi-flawed industry scam dewvoid of any thought or heat at all it's the antithesis of rock and roll but no one cares that a record sounds better cause you just can't buy them so it just doesn't matter at all and that's common sense