Ive spent hours putting music on my external SDcard making sure it has the right album/artist info etc. and I keep losing the music. Randomly i'll go to play an album and it will be gone. Then I will look in my LOST.DIR and there will be a crap load of files in there. For the hell of it I decided to add .mp3 to the end of a file and sure enough they were music files I was missing. I have heard that the class of the sdcard might matter. Anyone have any ideas, this has happened on more than one memory card.