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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 location | macOS equivalent | Description |
|---|---|---|
| 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/Preferences | Stores various application and system preferences. |
Note: On macOS, files in /Library are not loaded at boot time when booting into Safe Mode.