How to make it stop changing the photos on my SD card to weird symbols?

Danny

New member
When i take out the sd card from my camera and plug it in on my computer, after i unplug it and put it in my camera some of the photos says they contain no image data even though i didn't delete any. So when i plug it back on the computer and check the photo's, some of the folders are in strange symbols and when i try to open it, it won't because it doesn't recognize it.So i lost them. Is there anyway i can get them back or stop it from doing this? Also i use like 3 different SD cards on that same camera. So i'm always switching them.
 
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