Windows 10 BIOS mode on a 2009 Mac Pro

Discussion in 'Windows, Linux & Others on the Mac' started by s.m.t., Aug 1, 2016.

  1. s.m.t. macrumors regular

    s.m.t.

    Joined:
    Mar 7, 2010
    #1
    Is it possible to install Windows 10 a 2009 Mac Pro in BIOS mode? I have it installed in EFI mode with GPT partitions. But I would like to use an MBR formatted disk to test a video driver issue.
     
  2. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    Yes several MP owners have done BIOS installations of Windows 10. In fact, there are a few examples where you have to do the BIOS installation, such as if you have a Mac Edition GTX680.
     
  3. s.m.t. thread starter macrumors regular

    s.m.t.

    Joined:
    Mar 7, 2010
    #3
    do you use boot camp assistant? I have been booting from the USB key and installing from boot...
     
  4. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #4
    No, I do not.

    I vaguely remember when I used the USB drive and held ALT/OPTION at bootup that there were two separate icons, one for the BIOS installer and one for the EFI installer. But I could be wrong because (A) I never really paid much attention because I always wanted to do the EFI installer, and (B) I might be remembering the disc install instead.

    What do you see for choices when you boot up? Just the EFI installer?
     
  5. s.m.t. thread starter macrumors regular

    s.m.t.

    Joined:
    Mar 7, 2010
    #5
    I have a retail usb key installer... If I place that in and pull up the boot options, I only have a removable efi boot disk... :(
     
  6. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #6
  7. s.m.t. thread starter macrumors regular

    s.m.t.

    Joined:
    Mar 7, 2010
    #7
    Guessing the usb key Microsoft ships only has an EFI boot option. I popped in a Windows 7 cd and do have two options. Windows and efi boot. Sadly choosing Windows causes it to lock up (stuck on the boot loader).
     
  8. supermariofan25 macrumors regular

    supermariofan25

    Joined:
    Feb 7, 2011
    #8
    Try creating a Windows 10 USB by downloading the .iso file from Microsoft then using Bootcamp Assistant to make the install USB. This USB should be able to boot using legacy mode (Selecting 'Windows' instead of 'EFI Boot').
     
  9. s.m.t. thread starter macrumors regular

    s.m.t.

    Joined:
    Mar 7, 2010
    #9
    Thanks, was not aware you could download an iso from Microsoft, will give that a try!
     
  10. s.m.t. thread starter macrumors regular

    s.m.t.

    Joined:
    Mar 7, 2010
    #10
    Success! Had to download the Microsoft tool and pull down an ISO, burned that to DVD. At boot I have both boot options!

    Thanks for the help all!
     

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