My Canon SX740 HS will not read a Sandisk Extreme Pro SDXC USH-1 300mg/sec. No matter where I set the lock switch, the camera sees it as locked. I reordered the card and got the same results. Any help?
It is a 128gb card. Canon says that the camera will handle that. So, I'm thinking it's the speed? I use a 64gb extreme Pro and 170 mb/sec without issue. Thanks for your response
