MT Shooter wrote:
Both of these cards should work fine in your body. The FIRST thing I would check is to see if you have any bent pins inside the cameras card slot, a common issue with CF cards in Canon bodies.
If no bent pins are found I would try formatting the NEWER CF card in your computer, then re-inserting it into the camera and do an in-camera format, it should then work.
👍👍 good advice - bent pins are relatively common. There’s enough slop in the card guides such that if you’re not aligned correctly and continue to push too hard, you can bend a pin, and unless you’re lucky and it’s a ground pin (which is duplicated), the only option is to gently straighten the pin if possible or have the CF male connector block in the camera replaced (which is a $200-300 repair).