I'm just bought used Canon EOS 20D last week, now I had this kind of trouble. When I shot in JPEG mode, after few shot, I got "Corrupted Data" error message on 20D. When I transfer those "corrupted data" images from CF card to my PC, I only see this (the numnails in red circle): I've read a topic in this forum, some people blaimed for CF card's issue! But I have 3 CF cards (Transcend 133X), each card put on to my 20D still have the "Corrupted Data" problem! Firmware on 20D is v2.0.3! Please help me on this, I don't know what caused this problem. Thanks for your help.