Compact disc
Compact Disc wordmark.svg
OD Compact disc.svg
The readable surface of a compact disc includes a spiral track wound tightly enough to cause light to diffract into a full visible spectrum.
Media typeOptical disc
CapacityTypically up to 700 MiB (up to 80 minutes' audio)
Read mechanism780 nm wavelength (infrared and red edge) semiconductor laser (early players used helium–neon lasers),[1] 1,200 Kibit/s (1×)
Write mechanism780 nm wavelength (infrared and red edge) semiconductor laser in recordable formats CD-R and CD-RW, pressed mold (stamper) in read only formats
StandardRainbow Books
Developed byPhilips, Sony
UsageAudio and data storage
Extended fromLaserDisc
Extended toCD-RW
Released1 October 1982; 38 years ago (1982-10-01) (Japan)
March 1983; 37 years ago (1983-03) (Europe and North America)