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You can either select and erase unnecessary images one by one or
erase them in one batch. Protected images (p.316) will not be erased.
Once an image is erased, it cannot be recovered. Make sure
you no longer need the image before erasing it. To prevent
important images from being erased accidentally, protect
them. Erasing a RAW+JPEG image will erase both the RAW
and JPEG images.
Play back the image to be erased.
Press the <L> button.
The Erase menu will appear.
Erase the image.
Select [Erase], then press <0>. The
image displayed will be erased.
By appending checkmarks <X> to the images to be erased, you can
erase multiple images at once.
Select [Erase images].
Under the  tab, select [Erase
images], then press <0>.
L Erasing Images
Erasing a Single Image
> Images to Be Erased in a Batch