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If you boot holding down ALT, you get should get two Windows
installation options - at least, I did. One is a BIOS+MBR option,
the other an EFI+GPT option (i.e., similar to what OS X uses).
As far as I know, nobody on a Mac has been able to get option
two working.

As a consequence, you're stuck with BIOS emulation.

About Vista SP1:

"Adds support for new UEFI (Unified Extensible Firmware Interface)
industry standard PC firmware for 64-bit systems with functional parity
with legacy BIOS firmware, which allows Windows Vista SP1 to install
to GPT format disks, boot and resume from hibernate using UEFI firmware."

http://technet2.microsoft.com/Windo...f706-401e-abb5-eec42ea0a03e1033.mspx?mfr=true

Sorry to be pedantic but when I hold down the Option key all I get are the two disc options (OSX and Windows). Where do the options you mention appear?
Also, could Apple fix the EFI issue with a firmware update?
 
Sorry to be pedantic but when I hold down the Option key all I get are the two disc options (OSX and Windows). Where do the options you mention appear?

It has to be a Vista installer disc with SP1 included,
and it has to be a 64-bit version. You might check
your DVD for the presence of this file:

\EFI\BOOT\BOOTX64.EFI


Also, could Apple fix the EFI issue with a firmware update?

I would think so, and probably quite easily, but that's
guessing a bit. Whether they will or not, who can say?
 
With one of my planned Windows desktops still unavailable to me I've Boot Camped one of my Pros and am using it as a Vista 64 machine. It has a few quirks and can't be directly compared to a fully Vista 64 supported machine like a Dell Precision, but it seems to run well enough most of the time. I had no problems installing it.

It was only a few days after I'd installed V64 on this machine. Fast forward 4 days later having installed all of my apps and starting using it in anger as it were - and I've had 2 BSOD's.

Come to think of it, the only other machine I've had Vista BSOD's on in the last 12 months was a MBP I was boot camping Vista Business on.

My experience with V64 on the Mac however should be thankfully no longer relevant this weekend - as a real second Windows workstation is hopefully finally thudding back to my doorstep.
 
It has to be a Vista installer disc with SP1 included,
and it has to be a 64-bit version. You might check
your DVD for the presence of this file:

\EFI\BOOT\BOOTX64.EFI

I have the Vista Business 64 disc and the separate SP1 disc (I guess they didn't have the combo disc when I ordered but it shouldn't make a difference - right?
Where would I look for the \EFI\BOOT\BOOTX64.EFI file? In OSX or Vista?
 
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