You should provide more info like: what drives, what mobo, how do you connect them to the system. Most important - do you see both drives in your BIOS?
Mobo is an 870A-G54 and no, I don't see the HD in the bios. If it helps, the old HD did have windows Vista on it while the new one has windows 7. If I need to format the old one, I will, it's just that the old one has over 780gb of data on it.