I was dismayed to read the message on the screen saying it was full already when I had less than 10 albums on it. That's only about 100 songs. I bought the 2GB because someone said he was able to download 5 books as well as 1000 songs on his 2 GB Zen stone. Since there's no available manual for this model (ML 648B) and I don't know how to delete files, I'm stuck. Can anyone advise? Could it possibly be a defective MP3 player? It cost over $40 so I expected better.