Just checked my CF cards prior to tomorrow's shoot and one card is faulty. The MRU shows ERROR A:19:91. Any ideas anyone? It's a 32GB 133x Transcend which I don't think I have used yet.

That error code states "The CompactFlash you are using is not recognized. Check the type you are using." It could be a formatting error since you have others that do work.

That error code states "The CompactFlash you are using is not recognized. Check the type you are using." It could be a formatting error since you have others that do work.

Thanks for that Greg. No idea how I can format it though if it's not recognised - computers don't see it at all :(