Gave up trying to get Hyper-V Server 2012 to work…

http://technet.microsoft.com/en-us/library/ee731893%28WS.10%29.aspx

• Boot Hyper-V Server from USB flash devices
• Saves hot-swap drive bay for storage
• 16GB Flash device recommended
  • The following example sizes the VHD file for a 16GB flash drive
  • Get the fastest one you can
  • This device will be wiped and any data on it lost

During this procedure, carefully keep track of the disk numbers, partition numbers and drive letters. A mistake can ruin your whole disk!

1) Download and install WAIK: http://www.microsoft.com/en-us/download/details.aspx?id=5753

2) Download the Hyper-V Server .iso file

3) Mount the Hyper-V Server .iso file (G: used here for mounted .iso file)

• Free tool to mount .iso files

4) Create, mount and prepare the VHD (virtual hard disk) that will become your bootable USB flash drive.

Windows will prompt you to format the VHD; just click 'Cancel' as the VHD is formatted here already.

Open a command prompt as administrator:

mkdir c:\hvvhd 
diskpart 
create vdisk file=c:\hvvhd\hyperV.vhd maximum=12288 type=fixed
select vdisk file=c:\hvvhd\hyperV.vhd 
attach vdisk 
create partition primary 
assign letter=r 
format quick fs=ntfs label=hyperV 
exit

5) Apply the install image to the VHD. Leave the “diskpart” window open and open another command prompt as administrator.

• Change into the appropriate directory (x86 or amd64) based on the architecture of your technician workstation

cd "C:\Program Files\Windows AIK\Tools\<arch>\"
imagex.exe /apply g:\sources\install.wim /check 1 x:\

6) After that finishes, switch back to the “diskpart” command window (where diskpart is still running) to prep the USB flash drive:

list disk (to determine the disk number of the USB flash drive - '2' used here)
select disk 2
clean
create partition primary
select partition 1
active
format quick fs=ntfs
assign letter=z

7) Switch back to the “imagex” window and copy 'boot' files from the VHD to the USB target disk:

bcdboot x:\Windows /s z: /v

8) Switch back to the “diskpart” window and dismount the VHD file:

detach vdisk
exit

9) Safely Remove the USB flash drive from the technician workstation and test.