On 12/02/2014 12:49 AM, W wrote:
Does Windows 7 support the need UEFI replacement for BIOS? If yes, does
this require 64-bit Windows 7? Does it require the system partition and
boot partition to both be on a GPT disk?

Yes, of course, there no real difference between the UEFI BIOS and the
regular BIOS, except support for larger hard disks and a few other
things. UEFI maintains a compatibility layer with BIOS. The UEFI BIOS is
what loads the OS, not the other way around, so you should conceivably
be able to load up an ancient DOS disk through UEFI.

I have just recently done such a conversion. I went from a motheboard
with a traditional BIOS (Asus M4A785-M) to one with a UEFI BIOS
(Gigabyte 990FXA-UD5). Didn't have to reinstall the OS or anything.
Didn't have to change the disks over to the GPT partition either,
everything remained on MBR. Now I did also recently buy a 3TB drive
which requires GPT partitions to work, but I'm not booting from it
though, it's just a standard data disk.

I have a Windows 7 Ultimate 64-bit boot partition working on an old Dell
computer. That computer's BIOS says nothing about UEFI. When I try to
copy over the image of the system partition and boot partition to a a Dell
T7600 system - which DOES offer UEFI boot devices as an option - and try to
boot in legacy mode, I get a message that I am trying to boot a UEFI device
in legacy mode. Unfortunately, that device does NOT show up in the list of
boot devices. When I select the device 0 on the boot controller, I get a
message that the partition cannot be booted (without any details).

Yeah, if you want to boot from a disk formatted with GPT partitions,
then the steps for making it bootable is more involved. Here's the
solution he

How to establish and boot to GPT mirrors on 64-bit Windows
http://support.microsoft.com/kb/814070/en-us

Yousuf Khan