I use a Nikon D700 and Sandisk Extreme 16gb card, with a Lexar Dual Slot card reader for importing.
This morning I imported all of my photos to my Mac, removed the card, put it in my camera and formatted it (this is the first time i have formatted it.)
I took photos this evening and when I returned home I was unable to import anything. The blue light appears on the Lexar reader but nothing happens on computer. Lexar is reading SD cards fine still, so I assume the problem is with my card.
When I put the card back into my camera all the photos appear as normal and I am still able to take photos.
I have tried using a USB cable to connect the camera, and nothing happens.
Does anybody know what could be causing this? Could it be that I broke my card by formatting it?!