For the first time since entering the digital format in April 2009, an SD card has failed. It is a Sandisk Extreme Pro 32 GB SDHC UHS-II. When I inserted it in the card reader, none of the files were useable. The error messages indicate that the file info had been truncated. I re-formatted the card in the camera and took some photographs. Everything seemed fine, but when I inserted the card in the reader, it came up blank. After huge anxiety that it was the camera and not the card, inserting a different one worked perfectly.