SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.
The best thing to do may be to format the card. This not only wipes all photos from the card, but cleans up the directory. Formatting should be done every time you finish transferring pictures to your computer.
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