Q: Cannot install Windows 10 via BootCamp on iMac 5K with Fusion Drive
Hello,
I have been trying to install Windows 10 Professional via Boot Camp on my iMac 5K Late 2015 (OS X version 10.11) with a 2TB Fusion Drive for about a week now. Right now I'm on my 4th or 5th try on installing Windows 10 on the iMac since every install fails giving me an error that the drive is not formatted properly or it couldn't find the partition even though I've selected it in the list of available drives. I have even gone so far as to run the DISK PART commands from the command prompt in the troubleshooting area of the Windows 10 installer to format the drive as NTFS instead of FAT32.
Here are some of the errors I have received:
1. Windows cannot be installed to this hard disk space. This hard disk space is formatted with an unsupported version of the NTFS file system.
2. We couldn't create a new partition or locate an existing one. For more information, see the setup log files.
I have used the Boot Camp setup app (version 6.0.1) to create a USB flash drive after downloading the ISO image from Microsoft. The USB flash drive that the installer creates will boot the iMac but I just can't get past the "Where do you want to install Windows?" screen. I have tried partitioning the Fusion drive multiple ways without any success beforehand since I thought it could be causing a problem. It has been left as the full drive 2TB, or splitting the flash portion away and having the almost 2TB rotational and the 128GB Fusion (flash) portion and no luck either.
I'm completely out of ideas here on what to try... I've loaded Windows 7 Professional via Boot Camp many times and have never run into a problem with Boot Camp until now with Windows 10.
Posted on Oct 2, 2016 6:27 PM

