Encountered this error today with Raspberry Pi Imager v1.3 on macOS Big Sur Beta. In case it helps anyone the fix is to enable full disk access to the Raspberry Pi Imager. Didn’t find a solution when I did a quick Google so thought I’d post this here.Â
Raspberry Pi Imager “error gaining authopen to gain access to disk” on macOS by rakhesh is licensed under a Creative Commons Attribution 4.0 International License.