I have a portable, external hard drive that I use with Windows. It used to work fine with Parallels 3.0. It still works fine with Bootcamp and Fusion. With Parallels 4.0, when I plug it in, a window pops up and asks if I want to use it with my Mac or my Virtual Machine (Win XP Pro). I select "Virtual Machine." The "Devices" menu item lists my external USB drive as if it were connected. The USB controller icon in the tray lists it also. However, no drive is shown under "My Computer" and I don't get than normal Autoplay scan that I always see when I plug in an external USB drive.