Well, denizens of MacRumors Forums, I have often browsed here to find an answer to a trickier tech support problem, and have always met with success, until now. I am not even sure if what I want to do is possible, but if it isn't, it damn well should be. I have, in addition to my G4 Powerbook, a woefully underused AMD PC, with both Windows XP and Ubuntu Linux installed on it. I say woefully underused, and I mean it: this thing has 95% free hard drive space: over 100 gigs. Meanwhile, my PB has 5GB spare. So my question is, is there any way in hell (ethernet, firewire, weird partioning, ssh, samba, vnc... anything) that I can get all that lovely free space to show up as an external hard drive on the Mac (bearing in mind that I would still like to have a working desktop at the end of it all)? Its over to you now... please help me!