C D：ф120MM with650MB，it can save 74 mins entermainment problem. VCD：ф120MM with 650MB，it can save 74 mins entermainment problem. It can be widely used in all kinds of database info. CD-ROM：ф120MM with 650MB/74Min，It can be widely used in all kinds of database info. CD-R：it can be used in data-base, drawings, sounds and some other aspects. DVD-5: single side with single layer, 4.7GB； DVD-9 single side with double layers,8.5GB； DVD-10 double sides with single layer 9.4GB。