I shot with my Sony EX-1 last Friday, at a theme park for a client's company party. And their media rep brought me a 64 GB Sony SxS card, and it worked like a charm. But also, I sent my camera to Sony, and camera's firmware is at v1.30. So, you need to update firmware. I also use 32 and 64GB Transcend SD (SDHC) media cards, and have worked flawlessly.