Ok, I may have managed to find out the issue.

This may not have done anything, as the disk order did not change when I plugged the second back in, but there were 2 installed, Disk 0 (the original...

Windows 10 Pro
Biostar TZ77XE4

I have been able to "successfully" boot the CD Drive into UEFI mode to install Windows 10 onto my new 4TB SSHD, but I run into the error were it stats that the...