How to Reattach VHD on Windows

On Windows 7 and above, to reattach a Windows VHD (Virtual Hard Disk) file, do the following:

1. Open Command Prompt with elevated Administrator privileges

2. In the Command Prompt, copy the VHD file to your local hard drive by doing the following:

md C:\VHD
copy X:\windows10.vhd C:\VHD

(Replace X:\windows10.vhd with your VHD source file.)

3. Use diskpart utility to attach your VHD:

diskpart
select vdisk file=c:\VHD\windows10.vhd
attach vdisk

4. Look at which volume the VHD is attached to by doing the following:

list volume

5. Then, select this volume as follows:

select volume <the listed volume number>
assign letter=z
exit

6. Add this VHD to the Boot Menu by typing the following in the Command Prompt:

bcdboot z:\windows

7. Optionally, you can modify the description of the Boot Menu item that you’ve just added:

bcdedit /set {default} Description "Windows 10"

8. Reboot and enjoy!