I was taking a few photos today (for the "Post your Mac Setups!" thread ), and after I was done, I put my CF card in my reader. My iBook didn't recognize it at all. I put it back in the camera, and the camera easily recognized it and saw all of the images. I thought that it might be my card reader, so I put it in my PC, and when I tried to access the drive, it said "This drive is not formatted" or something. I tried to format it, and then Windows gave me the dreaded "this card cannot be formatted" message. I took some more pictures with the card, and then connected my camera directly to my iBook, and this time the Mac recognized the camera instantly. The card on its own, however, can't be recognized. I opened disk utility both when the camera was connected and when the card was connected and didn't see anything. Any ideas? I'm wondering if the card is just becoming corrupt. I guess I could just buy a new one if I have to, but I'd like to get this card working again. Thanks! EDIT: I've just fixed it somehow. It randomly showed up under XP again as a blank disk. Anybody have any ideas on why this happened? I'd like to avoid a situation like this in the future.