p.1 #7 · canon 6d always reads/blinks red light on sd memory card when closing card door
Why do you want to turn it off? I tells you that the card has been successfully inserted. It does not effect anything else on the camera. Better to have the light blink a few times when the door is closed than find the card is not recording when the first shot is taken out on a job.
p.1 #9 · canon 6d always reads/blinks red light on sd memory card when closing card door
The camera's computer takes a second or two to scan the card so that later when you review images it does not at that time take a second or two to scan the card.
Frankly, I find that a useful feature. (no sneer quotes needed )