So I shot some footage on my RED Epic. The card read fine in the camera and played back the clips. It loaded to my PC fine but would not copy over. I would start the process and it would act like nothing happened at all. Then I tried it on another computer, may MAC. All of the sudden it showed only 13gb and would fail to copy. Then I switched to a PC again and it showed 1gb. The card is full so I have no idea why it keeps changing the amount and I know we haven't done anything to it. Now it won't even playback in camera. Is there any way to run a test or somehow repair a card?