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Created Jun 6, 2019
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macOS Catalina mounts the read-only system volume at / and the read-write data volume at /System/Volumes/Data
% mount
/dev/disk1s6 on / (apfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk1s5 on /System/Volumes/Data (apfs, local, journaled, nobrowse)
/dev/disk1s4 on /private/var/vm (apfs, local, journaled, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
% ls /System/Volumes/Data
Device Users
% ls /System/Volumes/Data/Device
Applications System Volumes home opt sw
Library Users cores mnt private usr
# These are mostly the apps I have installed on this OS.
# I guess the presence of Safari means that it can be updated separately from the OS?
# Utilities is empty.
% ls /System/Volumes/Data/Device/Applications
1Password SF Utilities
% ls /System/Volumes/Data/Device/Library
Apple Extensions MessageTracer Scripts
Application Support Filesystems Modem Scripts Security
Audio Fonts OSAnalytics Speech
Caches Frameworks OpenDirectory Spotlight
ColorPickers GPUBundles Perl StagedDriverExtensions
ColorSync Graphics PreferencePanes StagedExtensions
Components Image Capture Preferences StartupItems
Compositions Input Methods Printers SystemExtensions
Contextual Menu Items InstallerSandboxes Python SystemProfiler
CoreAnalytics Internet Plug-Ins QuickLook Updates
CoreMediaIO Java QuickTime User Pictures
Desktop Pictures Keyboard Layouts Receipts User Template
Developer Keychains Ruby Video
DirectoryServices LaunchAgents Sandbox WebServer
Documentation LaunchDaemons Screen Savers
DriverExtensions Logs ScriptingAdditions
% ls /System/Volumes/Data/Device/System
% ls /System/Volumes/Data/Device/System/Library
Assets Caches PreinstalledAssets Speech
AssetsV2 CoreServices PreinstalledAssetsV2
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