Too much music on SD Card?

So my friend gave me an SD Card to put in my Sansa Fuze, it contained over 600 songs. The first week or so it worked fine. Then one day I got the, “FAT32 is corrupted, please connect to a pc and reformat disk”. So I reformatted it and put the card back in. Now when I go to Napster to add more songs, the icon of the MP3 player looks different and when I finally add a song, Napster crashes. I don’t know if I need to buy a new MP3 player or not. PLEASE HELP ME!

And yes I have reformatted it again and still no Joy…

 The fact that the icon looks different suggests that it’s using a different connection.

Try changing the USB mode from MSC to MTP (or vice versa).