![]() If you try to change something in a non-firmlinked directory, it'll fail because it's on a read-only volume (even if SIP is completely disabled).įor more details, see the Ars Technica review of Catalina, the WWDC2019 sesson "What's New in Apple File Systems", and a filesystem map from the Eclectic Light Company. If you change something in a firmlinked directory, the changes are stored on the data volume. System/Volumes/Data/Users shows up in /Users). There are also "firmlinks" that merge the content from the data volume in where it "belongs" (e.g. ![]() The system volume is mounted read-only as / (the root filesystem), and the data volume is mounted with read-write access as /System/Volumes/Data. What it does is split the files between two volumes: a system volume containing Apple-provided system files, and a "data" volume containing all non-Apple and modifiable files. Catalina introduced a new feature that overlaps and reinforces the filesystem protections that SIP provides.
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