Russ writes: I shoot Raw with my Canon 10d I put the media card in the slot in my computer and it shows I have files that are both .crw files and .thm files. What in the world are the .thm files have a peek here http://www.file-extensions.org/thm-file-extension "File extension THM description: Thumbnail bitmap image used by eg. Picture Publisher and PhotoMagic Thumbnail " if you rename them *.jpg you'll see they're actually just jpeg thumbnails and more importantly............... How do I stop the 10d recording them! not sure about that, maybe have a peek in the manual to see if thumbnails can be switched off karl