A CD can hold around 650 MB (MegaBytes) and 700 MB (MegaBytes). CDs are mainly
(1) CD-ROM (Compact Disc – Read-Only Memory)
CD-ROMs are compact discs that contain factory data from the very beginning. Computer Device Driver CDs; Found on audio and video CDs. If you look at the data screen of these CDs, you will not see burning tracks like other CDs.
(2) CD-R (Compact Disc – Recordable Once)
CD-Rs are blank CDs that can be used to record data with CD / DVD writers. These CD-Rs can only be used once and can no longer be re-written as Multisession Disc.