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

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Installing and Removing the Card
48
 
When the access lamp is lit or blinking, it indicates that images are 
being written to, read from, or erased from the card, 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.
• Unplugging and connecting a power cord (when household power 
outlet accessories (sold separately, p.530) are used).
 
If the card already contains recorded images, the image number may not 
start from 0001 (p.223).
 
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 images on the card to a computer, transfer all the 
images and then format the card with the camera (p.73). The card may 
then return to normal.
 
Do not touch the SD card’s contacts with your fingers or metal objects. 
Do not expose the contacts to dust or water. If smudges adhere to the 
contacts, contact failure may result.