That is good for a "dual boot" partitioned system (or on an external HD), but what about reading the "virtual disks"? For example, I have a Wubi install on one unit and use Virtual Box on another (although I might switch to VM Ware as Virtual Box has a conflict with Windows 7 that after closing out all activity and shutting down Win. 7, it goes into a loop - go to bed, check later and it is still clocking"). I seem to recall that Virtual Box supports 3 or 4 Virtual Disk types - not sure what or how many VM Ware supports. Likewise with other VMs (XEN, ???).