I took a lot of photos today. The pictures on the camera card could not be recognized. [View all]

All the hundreds of photos I took before today were fine. My camera works with other cards. The problem was only with the pictures I took today on that one card. Everything else worked fine. Even my camera did not recognize the pictures I took today when I tried to play them back. I downloaded all the files from the camera card to a hard drive and deleted them from the card. I ran chkdsk on the card and the result was no problems.

I would appreciate any thoughts on what I should do or similar experiences. I have got to sleep now.