Here I am at the zoo with my wife shooting a D300 at me! I am fussing with my D3 trying to figure why it has all of a sudden locked up. Nothing, Zip, Zilch, Nada! I finally remove the camera from the lens/tripod so I could look at it without standing on my head. Still nothing. In disgust, I pack it away and we are down to one camera. O well, I am hot, tired and all I really want to do is sit in my truck (air cranked up) and rest anyway. This was the second zoo of the day and I am getting cranky. What did I discover later? Two cards full! How stupid! O well, Such is life!