The data in question is a office suite - so i need it to autorun - one of my friends took all the winxp/me/98 versions (4.7gb) and somehow compressed it to fit a 700mb disk. (PS - if you copy it from the disk to ur hdd its a 4.7gb file again?) I streamlined all the updates/sp for office 03 into one - now its a 900mb file. Also i was just really curious how my buddy did it - he doesnt want to tell me!
RAR or WinZIP offer the best compression around. Use the advanced deflate option in Winzip to get the max. You will need WinZIP to unzip the files again.
As to how your friend did it, maybe he stripped out all the junk or options (other language support, addons, clipart, demos, templates etc). If you're
saying he compessed a 4.7GB collection of files into 700MB and was able to
recover the full 4.7GB afterwards he could only have done so using ZIP or RAR. If those don't work for you, sorry - he's BSing you.