I use a Mac Mini Late 2014 which has a fusion drive. I hit a common problem where it refuses to install windows using boot camp saying either:
- We couldn't create a new partition or locate an existing one
- The Partition type is GPT
I have tired a number of suggestions for fixing this issue with no luck. In the end I figured out a surprsingly simple solution, its part mine, part macriot.com
Create the USB media as normal
Reboot the Mac
Now add the bootcamp parition in the normal way
The Mac will reboot automatically.
If you see the partition type is GPT:
- Turn the Mac off by holding the power button down
- Turn the Mac on again and hold the alt key down.
The boot menu will appear, pick the efi option and press enter:
The Mac will start setup again:
If you format the bootcamp partition and then press next you will get the "We couldn't create a new partition or locate an existing one"
To fix this all you have to do is look at the other paritions. For some reason the fusion drive creates two EFI partitions. This confuses windows setup.
If you look at partition 4 (which is the bootcamp partion) it is on Disk 1. So we will simply delete the EFI partition on Disk 0. Unfortunatly I forgot to take a photo of this.
Highlight the EFI on Drive 0. Press delete and leave the small 200mb partition as unused space.
You should now have just the one efi partition:
Press the bootcamp partition again in most peoples case partition 4. Press next and it will work.