Did you check the label on the drives and make sure they both say they are the same size?
If this isnt for the Boot drive then just use Windows 8/10 storage spaces.
If this is the boot drive you will need a raid card or bios raid; and a backup drive as you will lose all the data on the main drives when you format the raid1 array. You'll also need backup software that can restore to dissimilar hardware if you don't plan on reinstalling the OS from scratch.