I have Windows 7 on SSD 1.
I have Vista on SSD2.
I have UEFI set with the EFI partition on SSD 1.
All is working fine.
I had an older SSD from a now defunct computer so I put it in and installed windows 8.1 on it - I don't really like 8 or 8.1 but want to have it available to obtain a free...