Jos van Eekelen , Jan 10, 2017; 01:07 p.m.
This is not an uncommon problem. When I encountered this I chose to ignore it and use an external cardreader. I'm sure there are methods to correct this issue but sometimes it's better to use an alternative and don't bother about the problem. Earlier cameras (10D/5D - about ten years ago) had a few interface settings to choose from, I don't know if this is still the case. Have a look at the manual.