I put files on my mp3 player from my computer at home. I can view them on the mp3 player and listen to them just fine. But when I plug it into my computer at work to take the files off to put on a CD for my boss, it will not show up. I find it strange that I can view/listen to them on the mp3 player, but they will not all show up when I try to view them through the computer. Can anyone help?