Life's random bits By b1thunt3r (aka Ishan Jain)…
Test Booting VHD from USB

Test Booting VHD from USB

Ishan jain
It is not supported!..

It looks like you need more then just bootmgr for booting a vhd. And these components will only be available on Windows 7 Ultimate and Enterprise Plus Windows Server 2008 and 2008 R2. Plus i think it is enough with WIM support under bootmgr.

Windows does not support booting to a remote share or a USB flash drive, whether installed on a physical volume or from a VHD.
You can boot the Windows Pre-installation Environment (Windows PE) from a USB flash drive, which is supported for Windows deployment.
Windows PE typically boots from either a Boot.wim or an installed image, but booting Windows PE from a VHD is not supported.

Frequently Asked Questions: Virtual Hard Disks in Windows 7

Other Resources