I'm installing windows 7 64-bit on my imac which I've done before but I get a message that the partition is GPT even after I format the bootcamp partition. I just upgraded my hard drive to a 3tb and I'm allocating 1tb for windows. How can I fix this?
I'm installing windows 7 64-bit on my imac which I've done before but I get a message that the partition is GPT even after I format the bootcamp partition. I just upgraded my hard drive to a 3tb and I'm allocating 1tb for windows. How can I fix this?
No easy fix for a few reasons:
1) Bootcamp requires a hybrid MBR for the partition table. That is: both an MBR and a GPT partition table at the same time with the GPT one having all partitions and the MBR one having only the ones that are relevant, but at most 4 of them (including the protective partition and the Macintosh HD one). Which leads us to:
2) The MBR part of the hybrid partition table cannot work with 3TB hard drives. MBR is limited to 2TB.
I am working on a small EFI app that can boot Windows in EFI mode on a Mac and that would mean that you can go GPT only on your system. The progress of the app is slow due to the nature of EFI and for now requires that you do an unattended Windows install with slipstreamed graphics drivers, but we are adding VGA loading on top of EFI quite soon after the rest of the app stabilises. The status of the app is documented at:
Win7 x64 booting natively via EFI (no bios emulation)
Windows does actually successfully boot in EFI mode on most Macs (anything with a 64bit EFI should work), but does not have graphics support even if you load the driver due to the VGA pci registers not being set by the firmware. Furthermore, in Setup and Safe Mode, Windows uses VGA instead of GOP which is a failure by design since VGA is a BIOS standard and not really compatible without hacks with EFI. Other EFI implementations also add VGA compatibility at a high cost to the firmware complexity for the VGA cards available on the market that don't actually contain anything in their ROM except the VGA BIOS.
My recomendations:
1) Install on a second smaller hard-drive; or
2) Wait for the EFI app to come out officially and use that to boot Windows Vista SP1 x64 and Windows 7 x64 (RTM and SP1) in the native EFI mode.
3) Wait for Windows 8 which supports VGA-less booting acording to the AMD presentation at UEFI Plugfest.
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