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

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You can use a CF card and an SD card with this camera. Images can 
be recorded when at least one card is installed in the camera.
If cards are inserted in both slots, you can select which card to record images 
to or can record the same images simultaneously on both cards (p.166-168).
1
Open the cover.
 
Slide the cover as shown by the 
arrows to open it.
2
Insert the card.
 
The camera-front side slot is for a CF 
card, and the camera-back side slot 
is for an SD card.
 
The CF card is [f] (Card 1) and the 
SD card is [g] (Card 2).
 
With the CF card’s label side facing 
you, insert the end with the small 
holes into the camera. If the card is 
inserted in the wrong way, it may 
damage the camera.
X
The CF card eject button (gray) will 
stick out.
 
With the SD card’s label facing 
you, push in the card until it clicks 
in place.
Installing and Removing the Card
Installing the Card
If you use an SD card, make sure the card’s write-protect switch is set 
upward to enable writing/erasing.
Write-protect switch
SD card (Card 2)
CF card (Card 1)