That’s been a ‘feature’ of every 2-slot Canon camera so far, so clearly Canon designed it that way intentionally. I presume the intent is to write to whatever card is available by default.So now it’s ALSO too dumb to know you’ve put a 2TB card back in, if you’ve closed the card slot door with it out?
Personally, I save RAW in duplicate to both cards – they can fail, and to me the point of two slots is to mitigate that (if more storage is needed, buy a bigger card). I have two sets of cards for my R3, and when I finish a shoot I just swap them both and format the incoming cards. That has the added benefit of giving me backup copies that last at least until the files transferred to my computer are backed up to my NAS. Point being, after I press the shutter button, I never have fewer than two copies of the image.
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