well it really depends, if you're talking about copying a
dvd movie to your hard disk and you only have 4 gigs IT
IS POSSIBLE! I recommend software such as InterVideo DVD
Copy which you can find at:
http://www.intervideo.com/jsp/InterVideoDVDCopyPlatinum_Pr
ofile.jsp
Software like or simaliar to DVD Copy compresses the dvd
movie into a smaller form preserving the quality. Most
dvd movies usually average around 700mb after this
conversion. The only downfall is that it is a long
process to convert, so you better have a powerful
computer!
Hope this information was helpful.