Nikon D300 User Manual page 43

memory card in the chapter titled Chapter 5, under the
heading called Format Memory Card.
Another way I'll rid myself of images I don't want is to view
them on the Monitor by pressing the Playback button and then
press the Delete button on the top left of the camera back
(marked by a garbage can symbol). You have several ways to
rid yourself of unwanted images with the D300(S).
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