I have a Sony Cyber Shot, and got the c:13:01 error message as well. My memory stick worked fine when I put it into my computer, but the camera kept telling me to insert the memory stick whenever I tried to use it. After looking through the messages on this board, I planned to format the memory stick as a poster said that would eliminate the error. Prior to fomatting, I browsed through the pics on the memory stick to ensure I had them all copied to the computer, and saw one that was somehow corrupted. I erased that picture, and did not format the memory stick, and now the error is gone. Hopefully this may help someone else having a similar problem.

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