I have 12mb of free space. I have 363 MP3 songs loaded onto the card.
I loaded them up through windows explorer. Put them all in the "music" folder
I even renamed all the songs to be <32 characters long.
When I go into the media player and click "explore" I can see all 363 songs. However when I go into "Music" that is where I only see half of the songs in the play list.