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I'm trying to install Windows 10 x64 on a Mac Pro (3,1). The Mac doesn't have OS X installed so I don't have access to Bootcamp Assistant. I tried the following:

  • Windows 7 USB DVD Download Tool
    • creates a NTFS USB and doesn't show up in Mac's boot selection screen (pressing option at boot)
  • diskpart + xcopy

    • creates a FAT32 USB. It only shows EFI Boot (the UEFI boot) at the boot selection screen but not Windows (the MBR boot)

      enter image description here

Did I miss something obvious here?

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    Since you have acess to a Windows machine, since you running the Windows 7 tool, instead just use the Windows 10 version of the tool its called Media Creation Tool and is on the Microsoft website. – Ramhound Aug 28 '15 at 18:56
  • Thanks for the info. I gave it a spin and it seemed can only download the setup .iso but not using a local .iso? I have an enterprise x64 iso so probably won't have luck with the Media Creation Tool. – Jim Aug 28 '15 at 19:57
  • There are no Boot Camp drivers for Win10 on a a 3,1 even if you can manage to force the USB installer. I never ever had any luck with anything other than a DVD installer on my old 3,1 so I would be very interested in any workarounds this question finds. – Tetsujin Aug 28 '15 at 20:34
  • @Tetsujin, that's what I eventually did. I burned a Windows 10 DVD. I've been using Boot Camp 4.0.3131 since Windows 8 and everything works. – Jim Aug 29 '15 at 2:54
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Simple answer here - https://youtu.be/qfqLmaesPvE 4 minute video. Basically, don't format as FAT32 and use this command prompt in terminal:

cp -rp /Volumes/CCCOMA_X64FRE_EN-US_DV9/* /Volumes/WINDOWS10/

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