How to Fix Cannot mount USB on Big Sur 11.3
This mini-guide provides a structural approach to troubleshoot and fix the issue.
Prerequisites
- Confirm your hardware specifications (CPU, GPU, Motherboard).
- Ensure you have a bootable recovery USB and backup your EFI.
Fix Steps
- Boot with
-v keepsyms=1 debug=0x100to identify the exact kernel panic. - Validate your config.plist using ocvalidate.
- Ensure your EFI matches the Dortania guide specifications for your CPU generation.
Verification
- Reboot and verify if the functionality is restored and stable under typical usage.
Original Question:
Hi folks, as title says, since going from 11.1 to 11.3, big sur has stopped mounting any usb external discs. Doesn't matter, if it's an usb ssd card reader, usb stick, or external hdd. Does anyone have a similar problem, and any possible solution? I can see it in disk utility but it says "not mounted". Formatted as exfat. If I try with a disk formatted as guid it mounts and is accessible. Didn't have this issue on previous big sur versions
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