Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 44)

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If the card is new or was previously formatted by another camera or
computer, format the card with the camera.
When the card is formatted, all images and data in the card will
be erased. Even protected images will be erased, so make
sure there is nothing you need to keep. If necessary, transfer
the images to a computer, etc., before formatting the card.
1
Select [Format].
Under the [5] tab, select [Format],
then press <
0>.
2
Format the card.
Select [OK], then press < 0>.
X The card will be formatted.
X When the formatting is completed,
the menu will reappear.
For low-level formatting, press the
<L> button to checkmark [Low level
format] with <X>, then select [OK].
3 Formatting the Card
COP
Y