I'm having an issue with my memory card. When I delete things off it while it is mounted to my computer it doesnt seem as though the files are getting deleted. The available space on the memory card stays the same. I'm using a Macbook Pro. My other problem was when I try to add all my music from this computer (around 8GB) it will not transfer, it gives an error. I need to transfer a group of folders at a time. Any ideas?