I tried shooting pics in the RAW format for the first time yesterday. After trying to view that on the camera, a message stating "Memory Card Error" has been coming up. I cannot save any new pics on the card, nor are the RAW shots I took showing up. I've tried formatting the card on the camera, but it simply shuts off when I try this. I've inserted a different card and that one worked fine, so it can't be the camera. I haven't tried shooting RAW on that card yet The card is a ScanDisk 256mb CF, and the camera is a Canon PowerShot S70. What to do???