Canon EOS 5D Mark III Instruction Manual (en)

Installing and Removing the Card
Open the cover.
Set the power switch to <2>.
Make sure the access lamp is off, 
then open the cover.
If [Recording ...] is displayed, close 
the cover.
Remove the card.
To remove the CF card, push the 
eject button.
To remove the SD card, push it in 
gently and release it. Then pull it out.
Pull the card straight out, then close 
the cover.
Removing the Card
Access lamp
When the access lamp is lit or blinking, it indicates that images are 
being written to or read by the card, being erased, or data is being 
transferred. Do not open the card slot cover during this time. Also, 
never do any of the following while the access lamp is lit or 
blinking. Otherwise, it can damage the image data, card, or camera.
• Removing the card.
• Removing the battery.
• Shaking or banging the camera around.
If the card already contains recorded images, the image number may not 
start from 0001 (p.156).
If a card-related error message is displayed on the LCD monitor, remove 
and reinsert the card. If the error persists, use a different card. 
If you can transfer all the images on the card to a computer, transfer all 
the images and then format the card with the camera (p.53). The card 
may then return to normal.
Do not touch the SD card’s contacts with your fingers or metal objects.