Why is my space occupied on iPod Nano, but all music folders show empty?

When iPod Nano connected to Winamp it shows 157 songs recorded and over 4GB being used. Once disconnected, it all folers are empty but it still shows over 4GB being used. What happened?

If your ipod nano uses Itunes then all of your music that you have sinked will be there, if you have added them by going to my computer then clicking on the Ipods documnets then they will after time stop working. You may have to download and then let them be added to your itunes, Another way is by adding a new Libary and then somehow try again to get the idear from scratch, make sure you save your music before you do tho :)