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It happened that after transferring photos from my new X-T50's SD card (formatted in the camera) attached to MacBook Pro, the card put back to the camera launched a message of a card error (or similar). Before using the card (Sandisk) in X-T50 I used it in Nikon D7100, without problems. Strangely enough, it was not possible to format the card in X-T50 (another error message). However, another Sandisk card appeared to work in X-T50 well. Then, I put the card with the error message back to Nikon and formatted it there successfully: It was possible to take pictures with Nikon. Surprised of this, I took the card back to X-T50 - and was able to format it! And I also took pictures without problems! Can anyone tell me what is this? As there are only one slot in X-T-50, this behaviour makes me nervous. Unfortunately, I cannot remember exactly but I had previously a problem of a similar kind, and I think it was associated with using the card in MBP, as now! Can an SD card be corrupted in Mac, although I just transferred pictures from it?? Perhaps it is safer to transfer pictures from X-T50 with a cable. Comments welcome!