Do you have Windows on that same drive ? or is that a single drive ? I have installed other Linux distros on about that size I guess its a matter of what gets put on it, I believe the download expands out to a little over 2 gig so from that i would think you would have enough room. I have it installed on a 10gig drive but I dont have it mounted and I am having so much fun with Sidux I doubt I will for a while, its one of those things when a distro catchs your eye and you really like it you dont wanna put it down for a while, Ive been using Sidux for about 4 days now, they use the latest stuff thats what has be so eager to use it.