I recently restored a W7 partition and chose to restore it to a new drive restoring both the MBR and disk signature. Now I want to use the old drive as either an internal or external backup and I dont think it is a good idea to have two drives with the same disk signature present in the same instance machine.

Can someone recommend a procedure for creating a new unique disk signature on the old drive so that it can be used in the same machine as the new drive?

Load the disk into another computer, then wipe sector 0. Put it back into the original computer and initialise and format the disk.

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If you can keep your head when all about you are losing theirs, you probably don't fully understand the situation. ... Mr Kipling

https://www.mjm.co.uk/

Sounds pretty straightforward. Hate to sound like such a novice but which tool do you recommend for the sector 0 wipe? Also is there an easy way to actually view the disk signatures to confirm that they are in fact dups?

Or just boot to an MHDD disk and erase the one you want to erase.

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You don't have to backup all of your files, just the ones you want to keep.