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yes sorry another card works fine as mentioned in my first post...

Thanks for your reply. I did not try format the card since I would love to keep this images...

Hello Guys,I am a fresh and lucky owner of Canon 6D.I have recently bought a brand new  "SanDisk Extreme 64GB SDXC 45MB/s 300X UHS-I Class 10 HD" to use with my Canon 6D and had a problem from the very first use. Has anyone ever had the error message...