Andrew <andrewfg1...@gmail.com> added the comment:

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:
https://support.apple.com/en-us/HT210650

More info on the container / firmlink scheme
https://bombich.com/kb/ccc5/working-apfs-volume-groups

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<https://bugs.python.org/issue41129>
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