Canon Rebel T2i EOS 550D Instruction Manual page 172

L Erasing Images
3 Erasing All Images in the Card
You can also erase all the images in the card. When the [3 Erase
images] menu is set to [All images on card], all the images in the card
will be erased.
To also erase protected images, format the card (p.42).
172
Select [Select and erase images].
2
Select [Select and erase images],
then press <0>.
The images will be displayed.
To display the three-image display,
press the <I> button. To return to
the single-image display, press the
<u> button.
Select the images to be erased.
3
Select the images to be erased and
press the <V> key.
The <X> icon will be displayed on
the upper left.
To erase other images, repeat step 3.
Erase the images.
4
Press the <L> button.
Select [OK], then press <0>.
The selected images will be erased.