Dell E7270 - SCCM 2007 OSD cannot detect GPT disk

Just got an e7270 for evaluation and trying to build OSD with our corporate Win7 x86 SOE on it, but when it boots into WinPE (x86 or x64), it doesn't detect any physicals disks.  I have enabled command support, so when I press "F8", run diskpart and use the "list disk" in the command window, it states that, "There are no fixed disks to show".

If I let the machine boot into the preloaded factory image (Win 8.1 x64), I can open diskpart and run "list disk" and it shows me the disk info which is a GPT disk and not MBR (I've not dealt with GPT disks before).

I've injected the Network and SATA drivers into the both boot images and still no luck.

Any guidance is much appreciated.