I don't keep anything on my JB3. Once I tape a show, it goes on the PC. Once saved to FLAC discs, I delete from my JB3. I don't use it for MP3s. And I use every once in a while for data transport from work, but all that gets deleted once copied to the home PC.
Since my JB3 is about empty anyways, I'm not sure how reformat might be different from deleting...
Thanks for the thoughts,
Terry