I don't use this camera often - only when I have the wherewithal to take it with me. The last two times I've used it, I've taken photos and when I've taken it home I've been instructed to format the card because it had not been formatted. Last time I was able to attach the card to a card reader and import the photos. I then reformatted the card. this time I took photos and when I tried to import them onto my macbook pro (2008), it said it couldn't recognize the card and to reformat it. What have I done wrong and is there any way to save these photos?