I have 3 corrupted Sandisk compact flash cards. I'm 99% positive the problem was the camera filmware and, after an update, I've had no more problems. That said, I'm traveling and working, and I wont be able to try solving the problem of these cards till I'm done. I want to save the cards the best way possible, making a backup in case something happens to the physical card. I use a Mac. Would making a disc image of the cards work? Might another solution be better?