Reset Time Machine "Do Not Use"?

Hello,
I have a new MacBook Pro retina, and wanted to take some files from my existing Time Machine backup disk. When I plugged the disc in for the first time, I got the dialog box asking me if I wanted to use this disc for Time Machine. The options were "do not use", "decide later", and "use". I chose "do not use". Now, however, when I chose the "browse other backups" option from the Time Machine menu, it does not show the disc at all. I think Time Machine must now be ignoring this disk.
Does this sound correct?
If so, how can I get time machine to recognize my disk again?
Thanks,
Michael Morrison

Bump.
Any insights into this?
Thanks!
Michael

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