Boot Camp installation, “drive is of the GPT partition style?

[Arkanok]

I have a mid 2010 Mac Pro, previously I’ve had windows (first 8.1 then 10) installed on a separate hard drive from the Mac OS. Recently I decided to do a little upgrade, so I bought two 1 TB hard drives, one for Mac OS and one for Windows. Getting everything back up and running however, has been a real pain in my a**.

I had no luck with boot camp assistant in Mojave, it just wouldn’t allow me to begin the boot camp process. So I decided to try installing High Sierra on one drive (figuring I’ll just update to Mojave after everything is set up) and the assistant worked as I figured it would, it created the driver USB and formatted the designated hard drive and rebooted. Went into the windows setup, selected which drive I wanted it installed on, but it wouldn’t work! I kept getting the error “the disk is of the GPT partition style”. I tried a bunch of things to get it to allow me to use the drive but nothing works.

can someone please help me with this? I really just want this to be finished.

 

[satcomer]

Sense your 2010 Mac is end of life Windows 10 Microsoft decided your not worth it! So you have to do the hack again in the new drive!

 

[ActionableMango]

can someone please help me with this? I really just want this to be finished.

• Windows installer in EFI mode will not install to an MBR partition type.
• Windows installer in CSM/BIOS mode will not install to a GPT partition type. It sounds like this is what is happening to you.

You can avoid these problems simply by deleting all partitions. This way there is no partition type and the Windows installer can create whatever type it likes. IIRC the Windows installer itself can wipe the drive in one of the steps in the wizard.

I would remove all other drives before doing this. It is easy to accidentally wipe the wrong drive, especially if the drives are identical size/brand.