You might want to try Tag&Rename, which you can find here.

I've had better luck with it than with mp3tagstudio, and it's everything I need for tagging.

Riocar 10gig (for now) S/N : 10101747 amber
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup