If you make sure and import always from one system then copy to the other you should not have any duplicate BookIDs. If you do end up with duplicates they will be listed in a log file. Then you can run the merge database instead of the rebuildand that will re-assign the Bookids of the duplicates to new ones.
If you just copy the new files to the second drive after importing them instead of trying to copy all again then you won't have a problem.
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Dale Douglass 2nd Generation Karaoke I am not a member of the MTU Staff.
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