What is the model name? Some MP3 players have a formatting utility that comes with the player or is available for download from the mfg. website.
In Christmas of 2004 I purchased a MP3 Player From **** Smith Electronics. It has worked fine until a couple weeks ago when it couldn't delete any files. I tried to format it using windows and DOS Prompt. I also tried deleting each file using both Windows Interface and DOS Prompt. This didn't work either and when I go to listen to music it says there are no files even though that there is no more space on the Drive. What do I do