None. Keeping your memory card in the camera is about the safest place to keep it. Then you never need to worry about forgetting to put it in when taking spontaneous shots.
You should format the card after each time you copy all the image files to your computer. This will assure that you don't end up with corrupted images, something that happens a lot when users try to make "more room" on their card as it fills by deleting individual files.
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