macos-big-surapfs

Big Sur macOS 11.2.1 (20D74) is running from "APFS System Snapshot" – How to fix?


The two volumes are present "Mac SSD" and "Mac SSD - Data". However, the "Mac SSD" volume is NOT mounted, but instead, an "APFS System Snapshot" within the Mac SSD volume is mounted and seems to be where macOS is running from.

How do I fix this?

Volume NOT mounted containing a MOUNTED snapshot

How I Got Here...

And here I am ... very confused.


Solution

  • It turns out that the snapshot is an intended security feature of macOS 11 and higher.