topic Re: EOS R5 Mark II - CARD FULL bug? in EOS DSLR & Mirrorless Cameras

EOS R5 Mark II - CARD FULL bug?

AlexanderBay — Mon, 28 Apr 2025 12:21:59 GMT

Hi,

I've shot a video (4K fine 24 fps), and the camera said "CARD FULL," so it stopped the recording. I put another card in and continued my day. Now I see when I put the card in my Mac that the card is only half full.... Any thoughts?

Thanks!

Re: EOS R5 Mark II - CARD FULL bug?

johnrmoyer — Mon, 28 Apr 2025 13:43:09 GMT

@AlexanderBay wrote:

Hi,

I've shot a video (4K fine 24 fps), and the camera said "CARD FULL," so it stopped the recording. I put another card in and continued my day. Now I see when I put the card in my Mac that the card is only half full.... Any thoughts?

Thanks!

If you had two cards in the camera it may have limited you to the smaller of the two depending upon camera settings.

If the card is larger capacity than the camera can handle, it might stop.

What program on the Mac did you use to view the capacity?

Was the card formatted in the camera?

More details are needed.

Re: EOS R5 Mark II - CARD FULL bug?

AlexanderBay — Mon, 28 Apr 2025 13:52:35 GMT

- the two card are the same capacity

- finder

- i formatted it in the camera

- i set to automatic switch if one card is happened to be full

- i am on the newest firmware

Re: EOS R5 Mark II - CARD FULL bug?

johnrmoyer — Mon, 28 Apr 2025 14:12:43 GMT

were there cards in both card slots?

what type of cards?

https://cam.start.canon/en/C017/manual/html/UG-10_Reference_0110.html

Re: EOS R5 Mark II - CARD FULL bug?

AlexanderBay — Mon, 28 Apr 2025 14:15:38 GMT

Yes there were. CFexpress:128 GB Sandisc Extreme pro (1200 Mb/s) and a Kingston 128 GB Canvas react plus (300 Mb/s U3 V90)

Re: EOS R5 Mark II - CARD FULL bug?

johnrmoyer — Mon, 28 Apr 2025 14:41:10 GMT

Sorry, I cannot guess the answer.

Re: EOS R5 Mark II - CARD FULL bug?

p4pictures — Mon, 28 Apr 2025 21:49:13 GMT

With the EOS R5 Mark II there is a limit to the number of movies that can be saved in the movie XFVC folder. You cannot have more than 999 movies in the folder, and it is possible that you have reached movie number 999 at which point the camera will say the card is full, but actually it's the file number that is at the limit.

See this section of the manual.

https://cam.start.canon/en/C017/manual/html/UG-07_Set-up_0060.html

Re: EOS R5 Mark II - CARD FULL bug?

AlexanderBay — Mon, 28 Apr 2025 21:50:27 GMT

eh no 😕 it was a 2 days old camera. No close to 999.

Re: EOS R5 Mark II - CARD FULL bug?

p4pictures — Mon, 28 Apr 2025 22:08:35 GMT

Check the filename to be sure that the clip number is not 999 or close to it. The clip number is the 8,9,10th characters in the movie file name.

Secondly I would try to use the auto reset of the clip number so that the clip number is reset when you change cards. The filename already has the date / time of the movie recording in it so not possible to get duplicate filenames on different cards.

Re: EOS R5 Mark II - CARD FULL bug?

AlexanderBay — Mon, 28 Apr 2025 22:22:34 GMT

Re: EOS R5 Mark II - CARD FULL bug?

Dilshod — Wed, 29 Apr 2026 08:13:38 GMT

I am reporting a critical and reproducible failure on the Canon EOS R5 Mark II after updating to firmware version 1.2.0.

The camera stops video recording and displays a false “Card Full” error while 60–70% of storage remains available. This occurs consistently after approximately 30–40GB of recording.

This issue is fully reproducible and not related to user error. I have already performed all standard and advanced troubleshooting procedures.

Confirmed facts:

Memory cards are always formatted in-camera before each shoot (including low-level format).
Multiple professional-grade cards have been tested:
• Delkin Devices Black CFexpress Type B 350GB
• Angelbird AV PRO CFexpress Type B 1TB (1750 MB/s)
• SanDisk CFexpress Type B 128GB Extreme Pro
• Lexar Professional 2000x UHS-II SDXC 128GB
The issue occurs across different cards and both slots.
Recording mode: Full HD (1920×1080) 60fps (also tested in 4K).
Photo mode continues to function normally when the error occurs.
Camera has been fully reset to factory settings.
New folders are created before each recording session.
The issue did NOT exist before firmware 1.2.0.

Additional technical observation:
The XFVC folder limit (999 files) is not reached, yet recording fails prematurely. This strongly indicates a firmware-level file allocation or recording logic failure.

Conclusion:
This is a firmware defect introduced in version 1.2.0 affecting video recording reliability.

This issue makes the camera unusable for professional work and results in financial risk due to recording failure.

I require the following:

Official confirmation of this firmware defect
Immediate escalation to engineering
A hotfix firmware release
Or an official rollback procedure to a stable firmware version

Please note:
I am not requesting troubleshooting steps. All standard diagnostics have already been completed.

I expect a technical response addressing the root cause.

Best regards,
Dilshod

Re: EOS R5 Mark II - CARD FULL bug?

Waddizzle — Wed, 29 Apr 2026 16:34:29 GMT

“ I am reporting a critical and reproducible failure on the Canon EOS R5 Mark II after updating to firmware version 1.2.0. “

This is a social media platform. It is not Product Support. If you wish to provide product feedback, then use the link on the site home page.

Re: EOS R5 Mark II - CARD FULL bug?

SignifDigits — Thu, 30 Apr 2026 00:15:14 GMT

Kudos for the documentation on your reporting, but we don't know if it will get to Canon for resolution from here. As Wadizzle mentioned you can report via the link, or I would also suggest you call (in the US) 1-800-652-2666

You can also access support via your Canon login.

If you are professional and a member of Canon Professional Services (CPS - sound like you should be if Canon gear is a critical part of your kit and if you have enough Canon gear to qualify) then you have a priority hotline for getting your bug reported and addressed via the CPS hotline at 1-877-CPS-8122 (1-877-277-8122).