I've run automatic compressor on an XP VD. It took 24 hours (MBP C2D) and I went from 24G to 19G but during the process I remember it halting to ask about ejecting a disk (I thought it had something to do with Oracle, which I have installed) and after getting it to continue I am now faced with a "Windows - Wrong Volume" dialogue after clicking the last "Finish" button. It wants the PARALLELS_COMPRESSOR volume in drive D: I'm assuming that compressor runs off the D drive and that is mounted at the beginning. How do I remount this so I can finish, or can I just force-quit the whole thing and be done?
Found it. It's a .iso file in the root Library/Parallels/Tools directory. Was able to attach that using the Devices menu. We're done.