The readable surface of a compact disc includes a spiral track wound tightly enough to cause light to
diffract
into a full
visible spectrum.
|
Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to about 80 minutes of uncompressed audio or about 700 MiB of data.
Media type
︎Optical disc
Read mechanism
780 nm wavelength (infrared and red edge) semiconductor laser, 1200 Kibit/s (1×)
Standard
︎Rainbow Books
Developed by
︎Philips, Sony
Media type
︎Optical disc
Read mechanism
780 nm wavelength (infrared and red edge) semiconductor laser, 1200 Kibit/s (1×)
Standard
︎Rainbow Books
Developed by
︎Philips, Sony
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.
Usage
︎Audio and data storage
Extended from
︎LaserDisc
Extended to
︎CD-RW / DVD
Capacity
︎Typically up to 700 MiB
Usage
︎Audio and data storage
Extended from
︎LaserDisc
Extended to
︎CD-RW / DVD
Capacity
︎Typically up to 700 MiB