I took photo's on a NIkon D5000. It let me veiw my photo's at first then it says Cannot Format memory card, Card maybe defective. Insert another Card. But I didn't even try to format the card. When I try to veiw them on my computer it say their is a I/O error for that particular file but it will let me veiw my Cannon files
Are you trying to have two different cameras write to the same card? That is a terrible idea. It's not that unusual for a camera to have trouble writing to a card that it didn't format. Use a separate card for each camera, and have the camera format that card before use and after each time you download the photos to your computer.
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