Originally posted by robertchow999 I have the exact same problem. The crazy thing is that the card works fine with both my 645D and my MX-1, just not the K-3.
This happened with my 128Gb card once. The solution was to put it in the other SD slot (SD2 if SD1 was being problematic), format it in-camera, then move it back to the original slot.
It may be a firmware bug related to which SD slot is currently considered "active", but that's just my guess. I hope the fix works for you!
Adam
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