VHD stands for Virtual Hard Drive. A VHD is created with/by programs such as Virtual PC, Virtual Server, Hyper-V, etc. and there's a standard format associated with them. If you're interested in reading more about VHDs, check out: http://en.wikipedia.org/wiki/VHD_(file_format). To use a VHD you need to have a program installed to "host" it. Think of [...]