http://www.techrepublic.com/blog/window-on-windows/convert-windows-xp-into-a-windows-7-virtual-machine-with-disk2vhd/3091
http://www.howtogeek.com/howto/8054/how-to-turn-a-physical-computer-into-a-virtual-machine-with-disk2vhd/
http://technet.microsoft.com/en-us/sysinternals/ee656415.aspx
VirtualBox 支持 Microsoft VHD。