OK, I know this is going to sound like a really stupid question, but I've got to find out if this has happened to others. I purchased my gently used 1D Mk IV early last March. I set the file type to RAW only (the big one), as I don't have any use for the sRAW or mRAW files. So I did a fair amount of shooting since then, but recently came to the realization that my files were not as large as they should be...upon closer inspection I see that I've seen shooting sRAW since early April.
No one else uses my equipment, so if this didn't happen on its own, I had to do it. But there would be absolutely no reason for me to make that change, so it would have been an error on my part. I guess I really am hoping that I screwed up, because the thought of having to check the file format every time I shoot would be aggravating if my camera has a mind of it own!