Alright, I understand pre-allocation of HD space. It pre-allocates, that space disappears, no problem.
My problem, is that I've been messing with VMWare Server and I've made virtual drives and then got rid of them, but the space doesn't free up. I've got 40GB or more in limbo.
I've thus far used VMWare, Virtual Box, and QEmu. I know VMWare has atleast 40GB of preallocated space floating around somewhere. The others, it's possible but I'm not 100% sure.
I just want to get back all the preallocated space and start over again...