I have a SanDisk class 10 64gb card, but it seems to give me errors from time to time on the OM-D. I was a bit nervous before buying because I didn't know if the 64gb version was reliable. I bought it, and used it on a Canon T2i, Canon 6D, and a Pentax K-5 II. I didn't have a problem with those cameras. Sometimes the camera gives me an error, and I can't take a picture or see the pictures on the card. Sometimes taking the card out, and putting it back in solves the problem. It doesn't work all the time though. I'm curious. What SD card do you use on your OM-D? I'm thinking of buying one that's 32gb.