On my 5100 I keep getting “SD CARD NOT INSERTED”. Pull it out again and re-insert. Problem fixed… until later. Seems like a common problem when I googled the issue for the 5100. I have a brand new San disk extreme 32gb.
I met another guy with the same issue, same card model, but 16GB. Same issue with his D5100.
Is this a known issue with this card? My part # sdsdx3-032g-a21.