Hi, PLEASE HELP... I did a photoshoot this weekend and took my SD card out of my camera, put into my SD card reader that plugs into my laptop so could start editing, never had this issue but nothing happened. So I removed card and put back into my camera (CANON 40D) and now would recognize photos and says needs to be formatted. I do not want to lose the photos from this and dont want to format.. HELP.. now what???
Put the card back into the reader, copy the files to your computer, then reformat the card. Most likely you didn't properly dismount the card (especially if you're on OSX), and the file system corrupted