Nikon D90 - Manual (Page 159)

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I
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, and have DOS “read-
only” status when viewed on a Windows computer. Note that protected images will
be deleted when the memory card is formatted (pp. 30, 202).
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.
2
Press the L 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 button.
A Removing Protection from All Images
To remove protection from all images in the folder or folders currently selected in the
Playback folder menu, press the
L and O buttons together for about two seconds.