During an error, Is it possible for the unit to store "un-used" data on the harddrive, like the File001.chk files that are created when win95 runs scandisk, or does it delete that kind of stuff?

Anything that is partially downloaded should turn up in Unattached Items next time you start emplode. I can think of a few ways that partial tracks could end up taking up space on the unit without emplode seeing them but future releases should take care of this (and pick up any files erroneously left behind by earlier versions).

--
Mike Crowe
I may not be speaking on behalf of empeg above :-)