Tom -
Sorry to hear about your mistake!
While SuperDuper! certainly can create a bootable done of the drive, it seems the better thing to do until you recover your data is to use your regular OS X install discs to place a clean copy of OS x on your external drive for this purpose. Once you're all recovered, you can then use SD! to make a backup of your data, which can help in the future should this happen again...
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--Dave Nanian
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