As you explained the situation, this is how I understand it.
Drive #1 = existing drive on computer
Drive #2 = Adding to computer with critical information.
Is this right so far?
How did you hook them up?
Option 1. Drive #1 and Drive #2 onto one IDE channel, i.e master & slave? Either by jumpering Master & Slave or by jumpering Cable Select on each.
Option 2. Drive #1 = channel 1, Drive #2 = channel 2, i.e. master & master?
After you had all of the drives connected, you formatted and reinstalled Windows on the Drive #1. Is this correct?
If it is, I am thinking that you used option #1, and you accidentally formatted Drive #2.
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