Hello! I have a little problem too... Last weekend I took pictures at an event. The problem is the following. I put the card in my laptop and downloaded the pictures but some of them were corrupted. I want to specify that I only shoot raw. I also changed the card reader and it's the same problem... Is it possible that the card is on the verge of death? I use a Canon 6d and so far I have not encountered this problem. I also connected with the phone to the camera and downloaded that image and it was ok, but there I think it was automatically converted to JPG... Thank you very much!
Have you tried reformatting the card in the camera. If not start there and see if the problem persists. If the problem persists replace the SD card. Also what kind of SD Cards are you using Full Size or Micro SD Cards in an adapter. Only use full size SD Cards. Micro SD Cards in an adapter causes a lot of problems with Canon cameras.
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