I somehow accidentally engaged Write Protect on a 4-gig Sandisk card in my E-PL1. I have downloaded the files with no difficulty, but I cannot format the card, either in-camera or in the computer. I have followed the directions in the IB with no success. In fact, the camera will not even allow me to access Card Setup in the menu with the card in place. The camera works fine with other cards. I hate to throw this one away, but may have no choice.