EOS R5 Mark II - CARD FULL bug?

[AlexanderBay]

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!

[Dilshod]

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:

1. Official confirmation of this firmware defect

2. Immediate escalation to engineering

3. A hotfix firmware release

4. 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

[Waddizzle]

“ 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. 

[SignifDigits]

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).