Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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If the card is new or was previously formatted by another camera or 
computer, format the card with this camera.
1
Select [Format card].
 
Under the [51] tab, select [Format 
card
], then press <0>.
2
Select the card.
 
[f] is the CF card, and [g] is the SD 
card.
 
Select the card, then press <0>.
3
Format the card.
 
Select [OK], then press <0>.
X
The card will be formatted.
 
When [g] is selected, low-level 
formatting is possible (p.74).
For low-level formatting, press the 
<L> button to add a checkmark [X] 
to [Low level format], then select 
[OK].
Before You Start
3
 Formatting the Card
When the card is formatted, all images and data on 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 and data to 
a computer, etc., before formatting the card.