I had a moment of panic earlier when I put one of the full SD cards from my friend's wedding at the weekend into the D80 to allow me to import them into Lightroom and it flashed "CHA" on the LCD screen. Then I remembered that I'd switched the used SD cards to the Lock position to prevent any accidental overwriting. A quick google later (the camera was still tethered to my laptop), and I find out that I'm not the only one to have spotted this