Because of game support on Linux, I was going to duel-boot on a second 1TB drive that I had laying around in an old dead iMac. Removed it and installed it into my PC, so I wiped it using Fedora 25's "Disks". I was not aware that you needed to format it in order for my Windows 10 USB installer to recognize it. It is invisible when I try to use
fdisk -l | grep '^Disk'
I know that it is a functioning hard drive because my UEFI sees it as simply "Hard Drive". It doesn't appear in the Disks program either.