An external DVD may or may not work well. DVD's rely on massive amounts of data trtansfer for smooth playback. Here's my suggestions: (1) either replace your CDROM with the DVD drive; or (2) if you're really pressed for space and neeed CDRW as well as DVD, get one of those Ricoh DVD/CDRW all-in-one units. Either way you would save some slots and you would get better performance from the DVD.