im sorry to contradict the other response but thats not true the hard disk in the mp3 would be gone what happens is that it erases all information on the disk including disk info so the computer dose not know what format to read it and even if you did manage to reformat it to the correct format it would not hold for long im sorry to say that is a lose and it would cost more to fix it then to buy a new one.
if any of this info was helpful please email me at cnvirus@live.com
Bradley Hillis aka Code Named ViRuS, May 2008