The infamous ERR 99 on the 10D

[Lionheart]

I've begun shooting in RAW mode exclusively yesterday for experimentation purposes and of course, continued learning. I get the infamous Err 99 every 3 or 4 frames. Doesn't seem to matter what the ISO setting or shooting mode is. I thought maybe I was shooting too soon between frames, but even giving ample time for the buffer to write to disk doesn't seem to decrease the occurance. I've fired roughly 6or 7 thousand frames from this camera (mostly at work in the office) in JPG format and have never gotten this error before. Any one have any insights?

[Photo-John]

You might have already tried both of these. But for mystery problems, try changing batteries and reformatting your memory card. In this case, I think the reformatting might do the trick.

[Lionheart]

Although I noticed I get the error more often on the Lexar 512 WA card than my Sandisk Ultra 512. Is it just a bug I wonder with shooting RAW? I'll see there's a newer firmware version out too (mine is v. 1.4 I think)