Nikon D3000 - Manual (Page 118)

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Protecting Photographs from Deletion
In full-frame, zoom, thumbnail, and calendar playback, the L button can be used to
protect photographs from accidental deletion. Protected files can not be deleted
using the
O button or the Delete option in the playback menu. Note that protected
images will be deleted when the memory card is formatted ( 0 21).
To protect a photograph:
1
Select an image.
Display the image in full-frame playback or playback zoom or highlight it in the
thumbnail list in thumbnail or calendar playback.
2
Press the L (A) button.
The photograph will be marked with a P
icon. To remove protection from the
photograph so that it can be deleted, display
the photograph or highlight it in the
thumbnail list and then press the
L (A)
button.
Full-frame playback Thumbnail playback Calendar playback
L (A) button