What is Compact disc?
{{Redirect|CD|other uses|CD (disambiguation)}} [[File:Audio_Compact_Disc.png|thumbnail|The read side of a compact disc]] A '''compact disc''', also called a '''CD''' is a storage device in the form of small plastic discs which store and retrieve computer data or music using light. Compact Discs replaced [[floppy disk]]s because they were faster and could hold more information. The CDs made floppy disks become [[wikt:obsolete|obsolete]]. CDs were invented by both [[Philips]] and [[Sony]] at the same time, but not together. Sony and Philips did work together to create a standard format and the technology to read CDs in 1982. CDs can hold up to 700 [[Megabyte|MB]] worth of data, which is about 80 minutes of music. Mini CDs were also made for special small programs like [[Driver (computer)|drivers]]. CDs that have computer information on them are called CD-ROMs, or Compact Disc - Read Only Memory. The [[diameter]] of a normal CD is 12 [[centimetre|cm]]. The middle hole in a CD is about 1.5 cm. ==Related pages== {{Commons|Compact disc}} * [[CD-R]] * [[CD-RW]] * [[CD-MO]] * Video CD or [[VCD]] * [[DVD]] [[Category:Compact Disc| ]]