I'm trying to install Windows on my Mac. I had no problems before, or on my older iMac/Macbook, with installing Windows on a Mac.
I decided to detach my Fusion Drive, so I ended up with a 3TB HDD and a 128gb SSD. That gave me more flexibility. The 3TB HDD is is formatted with APFS. In Recovery mode, I split the drive in 2 partitions. 750GB for Windows and 2250 for Mac Data.
Made a Windows Bootable USB with UNetbootin. With a downloaded Windows from the Microsoft.com website.
Before I booted into the Windows-USB, I detached every single USB-port on my mac, even Ethernet. (I've been there)
In the Windows installation, when checking which partition you want to use it says; "We couldn't create a new partition.."
I tried this many times, everytime I changed something. Maybe it worked. But no. This is what I've tried so far.
- Delete partition, Windows installer made a new partition of the unallocated space. Didn't work, same error.
- Opening cmd, using diskpart. Tried to delete the partition, create new one an format in ntfs - and try again. Still no luck. Had also difficulties with formatting only the partition on the HDD. But when I (accidentally) formatted it, it formatted the complete drive. But still didn't work afterwards.
- Use another USB-stick, 3.0/2.0, USB-port
- Tried another Windows installation
- Reset NVRAM and PRAM
I have no idea what to do anymore. I hope that here's a wizard who can tell me what to do!
Thanks for your time!