Canon 1D X - Manual (Page 280)

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You can either select and erase images one by one or erase them in
one batch. Protected images (p.273) 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.
1
Play back the image to be erased.
2
Press the <L> button.
X The Erase menu will appear at the
bottom of the screen.
3
Erase the image.
Turn the <5> dial to select [Erase],
then press <0>. The image
displayed will be erased.
By appending checkmarks to the images to be erased, you can
erase multiple images at one time.
1
Select [Erase images].
Under the [31] tab, select [Erase
images], then press <0>.
L Erasing Images
Erasing a Single Image
3 Checkmarking <X> Images to be Erased in a Batch
When you set [86: Default Erase option] to [[Erase] selected], you can
erase images quicker (p.332).
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