System folder

The System folder is the directory in the classic Mac OS that holds various files required for the system to operate, such as fonts, system extensions, control panels, and preferences.

System Folder locationmacOS equivalentDescription
Extensions/System/Library/Extensions
/Library/Extensions
Classic Mac: Stores OS extensions (init format)
macOS: Stores kernel extensions and drivers (kext format)
Startup Items/System/Library/StartupItems
/Library/StartupItems
Stores files or scripts to be executed at boot time.
Control Panels/System/Library/PreferencePanes
/Library/PreferencePanes
Classic Mac: Stores system configuration programs, which are loaded at boot time.
macOS: Stores the various properties that appear in System Preferences.
Preferences/Library/PreferencesStores various application and system preferences.

Note: On macOS, files in /Library are not loaded at boot time when booting into Safe Mode.

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