My camera reads card full but I know it isn't, can anybody help me with this? t3i

[dastevens1]

My camera reads card full but I know it isn't, can anybody help me with this? t3i

[MikeSowsun]

What card do you have?

Have you used it in the past without problems? 

I would try formatting it in the camera and see if that helps. (first download any photos you want)

[superimposed]

Do you have a computer to verify the freespace? Your card isn't locked is it?