Hi I can tell that sometime you have to format within computer using external memory card reader, not from camera. It is not recommend switching around one sd card to another camera. It cause card error. If you want to use it, then you have to save pictures somewhere in other storage or computer, and format the one you want to use in computer using external memory card reader. And then one more time format in camera (you have to insert memory card into camera) These method very helpful on like your problem. If not working, then you have either camera defective or memory defective. Thanks and best regard!
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