This is an important question to bring up, I think (sorry if it's been brought up before), but, as I've said previously, I've been having issues doing the in-place upgrade for Win 7. It's BSOD'd on me four times now (fourth time I even uninstalled everything it said for me to) every time it gets to that last step. So I have an idea that I think others have had in the past when they have too much to save onto any flash drive or physical media and don't have an external HD lying around: use their internal slave drive so a clean install doesn't wipe them out. Thing is, that's where many people are squeamish about doing things that way, because not many know for sure if the clean install process will touch the slave drive, and what effect will it have on it if it does (I have a 1TB slave that is just screaming to be used, and so I've done this, and by the way, if I clean install, I'm doing the 64-bit version, which will probably require booting from the disc drive). But anyway, if anyone could give this answer so people are aware, it would be helpful (I googled to see, and there are posts asking about XP installs (with people answering that it shouldn't), but 7 might be different).