Rick, I format my cards in the camera almost without fail. I have done individual deletions when there were just a few iamges on the card. I would put my money on me reformatting before this event, but would not bet my life. ;- )
Unfortunately the images get copied onto my HD then when I see they are there and all looks ok I format the card in my camera. A quick glance at a couple hundred images was not good enough to see this problem until too late.
Alan, ouch at 1/200th and 6400. I tried flash once during my sons's freshman year of basketball. None complained and the players told me they never saw the flash go off when shooting.
Thanks much for the idea's and suggestions everyone.