Spawn_20240
What version of the MP3 Player Utilities have you got installed on your computer?
You might want to try installing ver
3.68 instead and see if you can format it.
You can also try the:
Format Utility for USB Devices from
here to try to format your player.
bsaylors is right. Unfortunately filling it up doesn't tell you much until you try to play them all. The hacks are good enough now to make it look like it's copied across but in actual fact, if you try to play them all, you might get errors....