Hi guys,
I just wanted to give a short update of what I did.
I have put my card with an external card reader in the 3.0 USB port and waited at least 1 min, the adressbalk went green very slowly… Once completely green I clicked right mouse and waited again like 45 sec till popup showed up, then I have select format, again it took long till format tool opened. I deselected “fast formating” and clicked format, after like 10% the progress bar stopped. So I took out the memory card and re inserted it. This time it was quiete fast but still I couldn’t open the memory card. So I clicked again on format card and this time I did the “fast formating”, it took like 10 sec and their it was… my memory card showed up, I could open it and even my canon reconize it.
I don’t know if I got luck, if those steps has nothing to do with but it worked for and that what is important.
I wish you all good luck, I just saved up $ 300 
