Had you ever initialized (formatted) the card, especially when you first got it? If not, an unformatted card will work fine initially, but almost always corrupts with time after many pictures are added. To prevent this issue permanently, you should always format a new card. But note formatting will erase the card! If you haven't saved your pictures yet, and you're having trouble locating them on the card with your computer,
see this article. After you've recovered and saved your photos, format the card IN THE CAMERA using the camera format feature (look for it in its menus). This will rejuvenate the card, and prevent this from happening again.
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