topic EOS R10 rejecting all SD cards except for one in EOS DSLR & Mirrorless Cameras

EOS R10 rejecting all SD cards except for one

Topfi — Thu, 16 Jul 2026 13:15:11 GMT

Hi my canon r10 is rejecting all my sd cards except for one!

I have Sandisk extreme 64gb sdxc v30, Sandisk extreme pro 64gb, Sandisk ultra 64gb (micro), sandisk ultra 32gb, and sandisk 8 and 2 gb blue cards. Now my r10 can only shoot in the 32 gb. When i plug the other sd cards it just says "card cannot be accessed, reinsert or format blablah"

I cant even format those cards inside the r10, but they work perfectly fine in my 7d m2 and my pc. Note that i bought the extreme PRO alongside the r10 and it also doesnt work. I dont know what to do.

Re: Canon EOS r10 sd card issue

kvbarkley — Thu, 16 Jul 2026 12:20:06 GMT

First, ditch any micro cards.

You can try to look inside the card slot and see if any of the fingers are bent.

IIRC, the larger cards use an extra set of pins, it could be that those are damaged leaving you with only the lower capacity cards.

Re: EOS R10 rejecting all SD cards except for one

ebiggs1 — Thu, 16 Jul 2026 14:20:01 GMT

"First, ditch any micro cards."

Most of the time I don't think you can damage the contacts in the SD slot but if you used the micro adapter that is a real possibility. Damaged contacts. For your sake I hope that isn't true. I am afraid you need to call Canon and set up a ticket to have it examined. 1 (800) 652-2666

Re: EOS R10 rejecting all SD cards except for one

ebiggs1 — Thu, 16 Jul 2026 14:26:15 GMT

"You can try to look inside the card slot and see if any of the fingers are bent."

You can try to straighten bent pins. But the pins are very thin and you can snap them completely off in a heartbeat. And that will require a much more expensive Canon repair. If you try make sure you remove the battery first because you could short out the pins which would damage the MB.

Re: EOS R10 rejecting all SD cards except for one

TomRamsey — Thu, 16 Jul 2026 23:29:03 GMT

Are the cards all UHS1 or UHS2? where did you buy the cards? unfortunately counterfeit cards are common and may be a much lesser card than labeled. You really should not use any card that needs an adapter, it’s just an extra thing that can go bad.

Re: EOS R10 rejecting all SD cards except for one

Topfi — Fri, 17 Jul 2026 09:16:01 GMT

Cards were bought in official sandisk store, confident to say all of them are legit.

Re: Canon EOS r10 sd card issue

Topfi — Fri, 17 Jul 2026 09:17:33 GMT

Yeah i only have one micro card, and its the last thing i tried just to test. Pulled it out of my digicam. Seems like the sd card slot assembly has a problem.

Re: EOS R10 rejecting all SD cards except for one

Waddizzle — Fri, 17 Jul 2026 09:57:03 GMT

“ Cards were bought in official sandisk store, confident to say all of them are legit. “

That sounds like you purchased them from an online marketplace, Amazon. If you read the fine print in the purchase agreement, you will see that they can select a different vendor when you selected vendor is out of stock.

Only buy camera accessories directly from a reputable camera dealer; Canon USA has a list of “factory authorized dealers.” I use bhphotovideo, exclusively.

Re: EOS R10 rejecting all SD cards except for one

Waddizzle — Fri, 17 Jul 2026 10:29:28 GMT

“ I have Sandisk extreme 64gb sdxc v30, Sandisk extreme pro 64gb, Sandisk ultra 64gb (micro), sandisk ultra 32gb, and sandisk 8 and 2 gb blue cards. Now my r10 can only shoot in the 32 gb. “

Hiw old are the 2 and 8 GB cards? I f didn’t see them in the Sandisk Store. Swapping cards between cameras almost always creates problems. Have you tried low level formatting the 32 GB cards in a Windows computer?

Re: EOS R10 rejecting all SD cards except for one

ebiggs1 — Fri, 17 Jul 2026 14:17:29 GMT

"Have you tried low level formatting the 32 GB cards in a Windows computer?"

Good idea, try it.

Re: EOS R10 rejecting all SD cards except for one

ebiggs1 — Fri, 17 Jul 2026 14:21:29 GMT

"That sounds like you purchased them from an online marketplace, Amazon."

If you did buy from Amazon always check the "Sold by:" claim. Not saying you got corrupt or counterfeit SD but it could be a reason why you are having this issue so it bares some checking.

Re: EOS R10 rejecting all SD cards except for one

LeeP — Fri, 17 Jul 2026 15:56:57 GMT

in the future, consider buying from a reputable dealer like B&H Photo (there are other good stores too). I've found B&H to be just as fast as Amazon on in-stock merchandise, but the difference is that B&H will be there for you after the sale.