This is an easy way to select a startup disk before your Mac turns on. Your Mac will boot from the startup disk you selected.
Press the power button to turn on your Mac.Connect the drive you want to use as a startup disk to your Mac.There’s also a way to select a startup disk immediately after you turn on your Mac. To change your startup disk back to the primary disk, repeat the instructions and select the primary disk as the startup disk. Press the power button and simultaneously hold down the Option-Command-P-R keys for about 20 seconds. Select the hard disk or partition you want to use as the startup disk.Ĭlick Restart to restart your computer and boot from the selected startup disk.
#Startup disk mac restart how to#
Here’s how to change your Mac’s startup disk:Ĭonnect the drive you want to use as a startup disk to your computer.įrom the Apple menu, select System Preferences. Changing Your Mac’s Startup Disk with System Preferences Normally, the startup disk is set as the hard disk inside of your Mac, but you can use an external hard drive, USB thumb drive, or DVD as your startup disk. This is why we recommend clearing cache regularly. When your Mac turns on, it loads the operating system on the designated startup disk, a hard disk or partition containing the macOS operating system. When there are too many stored on Mac, they can cause the startup disk almost full problem. AirPort Apple Apps Backups Developer Education Email Hardware Internet iPad iPhone Mac Music Network Photos Security TV Weekend Wonk
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