OWC Atlas Pro CFexpress Type B Memory Cards: Canon Camera Power On Notice

Support Article

Details

Select Canon camera users may experience the device locking up when powering on with inserted OWC Atlas Pro CFexpress Type B memory cards or other 3rd party memory cards.
- Affected Cameras:
  - Canon R5 (Firmware 2.2.0)
  - Canon R5 MK II (Firmware 1.1.1)
  - Canon R3 (Firmware 1.9.0)
Users may have this experience after performing a camera update. Canon's recent update introduced a bug in partition recognition.
- Memory cards formatted in macOS contain a 200MB EFI system partition that is locking the camera when being powered on.

Instructions

The memory card should be removed and formatted in macOS with a “Master Boot Record (MBR)” scheme.
- Restart the camera by removing and reinserting the battery.
  - Reinsert the newly formatted memory card and power on the camera.

Free Support Chat

Our free award-winning support team is ready to answer all of your questions. Technical support is available Monday - Friday: 9AM - 6PM. Customer Support & Sales is available Monday - Friday: 9AM - 6PM. Support is unavailable on U.S. Federal holidays. Talk to a human today.