100% agree, there is nothing we can do short writing our own firmware updates with the proper BIOS emulation layer for the Mac Pro. If the emulated BIOS doesn't think the chipset is capable of running HDs in a certain mode, the computer CAN'T do it, no matter what drivers you install in windows.tobyg said:The bios emulation that is done via the CSM in EFI is different for all hardware. EFI. Just like every standard computer has a different BIOS, the Mac Pro and Macbook Pro will have different implementations of EFI and the CSM/BIOS emulation. So what I'm saying is just because the Macbook Pro works, doesn't mean the Mac Pro will. Way different hardware, way different EFI drivers and CSM/BIOS emulation even though it looks pretty much the same to the user.