Originally posted by Not a Number A warning from that website may provide a clue...
"If an SDXC memory card is used through the direct SD slot of a computer without SDXC driver installation, the card may not be recognized correctly and a message to prompt formatting may appear. In this case, do not format the SDXC memory card. It may erase the data on the SDXC memory card and format the card for a different file system, making it incompatible with SDXC devices."
Sounds a lot like what is happening with the OP...
May need to D/L the SDXC driver mentioned?
Originally posted by FtYoU When I take some picture I turn off the camera wait for 5sec until the light stop blinking. I remove the card and put it back it straight away.
Why are you turning OFF the camera?? The blinking light means the camera is writing to the card. You are introducing the possibility of soooo many errors turning off power to a device in the middle of a memory dump..