![]() ![]() You’ll be invited to create a new owner for that, with the offer of migrating the current user. When the 11.3 installer is unable to find a suitable Data volume on the external disk, it then creates a fresh Data volume during the installation. Experience suggests that this may not always be completely reliable, though, and you should be prepared for it failing. If it finds one which it can bond the System volume to, then the installer prompts you to select one of its existing users for authorisation and should then complete the installation using the existing Data volume. The Big Sur 11.3 installer tries to detect whether there’s an existing Data volume on the disk on which it’s installing Big Sur. ![]() ![]() Either way it’s essential to have a good backup of your Data volume before proceeding. The other option offered is to install 11.3 in Recovery Mode, which you may prefer to avoid. If that happens to you when trying to start up from an external bootable disk with an older version of Big Sur, the best choice is likely to be to restart from the internal SSD, download the full 11.3 installer, and install from that to the external disk. macOS complained that the external SSD lacked authorised users, but when one was selected, it restarted into Recovery Mode and decided that it couldn’t boot from that installation of macOS after all. However, in my case, once I had updated internal SSDs to 11.3, I was unable to use the Startup Disk pane to boot from that external disk. Some users report that, when started up from their external SSD, they have been able to use Software Update to update that disk to 11.3. Significant improvements come in updating Thunderbolt SSDs which already have macOS 11.2.x installed. This article summarises the current state of support following the 11.3 update. To explore this, I’ve spent many mindbending hours with two M1 Macs, a mini and a MacBook Pro, a couple of external SSDs and a bunch of cables. Big Sur 11.3 progresses support of external bootable disks by M1 Macs, but can still appear flawed and unreliable, at least with non-Thunderbolt SSDs.
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