Up until recently I had 2x 1tb drives.. one with the install and one as storage. I connected a new 3tb, installed windows again, copied data across from old drives. it wouldn't load unless I had at least one fo the old tb drives connected too though.. if either one is connected then its fine, even if its just the drive that never had an installation on it, wtf? I tried tthe rescue option from windows 7 disc, and it detected and SAID it fixed issues, it didnt. I got a different error message...
New install on new drive, wont load unless old drive is connected.
New install on new drive, wont load unless old drive is connected.