My camera shows "err cf" when inserting a cf card, and my computer will not read them ethier. I have tried 12 dierent cards,some new and some old. only one will work. most of these cards have been used in this camera before and worked. This is a recent problem. The camera will not format the cards.
-   Just today this occurred for me too. The last time I saw this I had to send my 5D in for repair as a single brass pin, (one of 50) insode the card slot was yanked out by another CF card which I discarded. But looking now I see all 50 pins and none are stuck in the card. Also I have made sure that the San Disk CF card Extreme III was set to the 4GB selction. There are 3 selections for this card, if you are looking at the pins, rotate to the right, and on the far left of the side panel you will see a slider, (it is not so obvious if you do not possess young eyes) make sure it is locked into a position to match the label, either 1,2, or 4GB. Mine is and yet it still will not format.
I do have the option on my PC but it is always better to format the card with the camera vs the pc.
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