[srievley]

One thing that may have happened is this: If you were using the card on a computer (either through disk drive mode or with the card in a reader) and you delete files on the card, make sure you empty the recycle bin on the desktop. When you delete files in Windows, it creates a hidden folder called "Recycler" on the volume that the deleted files exist on. Try opening the card from the computer you last used the card on and empty the recycle bin. This happened to me once and it took me a while to figure out what happened.