Hey guys. I have been hearing a lot about formatting memory cards, which is totally new to me. I have never formatted a card, and didn't even know what it was until i just Googled it. I have always just put the card into my camera and shot away, then after loading the pics onto my macbook i would let the computer software delete the originals. I have never had a problem, so why is formatting important? What does it do? Do you guys format a card before every shoot? Thanks guys!