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Author andrewfg1992
Recipients andrewfg1992, ned.deily, ronaldoussoren
Date 2020-08-11.16:13:59
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
Hi Ronald. The basic idea is that >= macOS 10.15.1 Apple has made most of the filesystem read only on a folder by folder basis. They separate user-writable onto a separate filesystem, treat it like a disk, and they mount it under /System/Volumes/ as "Data". Likewise, I think the idea is that other volumes get mounted under /System/Volumes, however, since "/System/Volumes/Data" is now "firmlinked" to root, I imagine you can find mounts to the writable filesystem under "/System/Volumes/Data/Volumes" which firmlinks to /Volumes.

About the read-only system volume in macOS Catalina:

More info on the container / firmlink scheme
Date User Action Args
2020-08-11 16:14:00andrewfg1992setrecipients: + andrewfg1992, ronaldoussoren, ned.deily
2020-08-11 16:14:00andrewfg1992setmessageid: <>
2020-08-11 16:14:00andrewfg1992linkissue41129 messages
2020-08-11 16:13:59andrewfg1992create