Startup Disk (System Preferences)

The Startup Disk pane of System Preferences in macOS was developed by Apple to allow users to select a bootable startup disk. When locked, access is limited to users with administrator privileges.
==History==
With the first release of Mac OS X, the Startup Disk preferences pane superseded the Startup Disk control panel from classic Mac OS.Road to Mac OS X Leopard: System Preferences by Prince McLean, AppleInsider. 2007-10-24.
==Usage==
Users can choose from a list of available, bootable versions of Mac OS X, such as an installation CD-ROM or DVD-ROM. Mac OS 9 can be selected in instances where older hardware will support it. Alternatively, a Network Startup volume can be selected. If there are many bootable folders to choose from, a horizontal scroll bar will appear.
The Restart... button can be clicked to reboot the Mac immediately after confirming in the dialog box that follows.
===Other options===
The Target Disk Mode... button can be clicked to have a Mac restart as an external drive through a supported interface, such as FireWire, Thunderbolt, or USB 3.0. However, this feature is being replaced with Mac Sharing Mode on Macs running Apple processors, starting with the Apple M1 in late 2020.Apple Silicon Macs will offer new macOS Recovery options, replace Target Disk Mode with Sharing Mode by Chance Miller, 9to5Mac. 2020-06-24.
==References==
==See also==
*Startup Security Utility
==External links==
*Change your Mac startup disk at Apple Support
**Determine which disk started up your Mac
Category:System Preferences