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This guide provides information about Compact Discs. Click here for information on the Terminal command, cd.

CDs (or Compact Discs) are an optical disc used to store a reasonable amount of data (usually 650 or 700 MB), vastly more than floppy disks which they were seen by some to replace. CDs were popularized in the 1990s and are still in widespread use today, although they are facing obsolescence due to the larger storage capacity of the DVD (which can store 4.7 GB).

All recent Macintosh models can read, and non-educational models can write to CDs.