Here is how:. If you see a message prompts that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility, and then allow your Mac to use an external startup disk.

Permanently set startup disk at boot time | Macworld

Your Mac starts up from macOS Recovery. Requirement Starting up your Mac from an external disk requires the following: Intel-based Mac. Step 2: Click the locked icon and then enter your administrator password. Step 3: Select External drive as the startup disk, then restart your Mac.

What to do if your Mac does not boot from the selected drive If you see a message prompts that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility, and then allow your Mac to use an external startup disk. Step 1: Open Startup Security Utility. Leave a Reply Cancel reply. Get your privacy back.

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How to choose a startup disk on your Mac to boot from USB You set your Mac or Macbook which disk to start up from when more than one startup disk is connected. Set the default startup disk You can change the startup disk your Mac automatically uses from System Preferences.

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From the Apple menu choose System Preferences. Select your startup disk from the list of available volumes.


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  8. Temporarily change your startup disk with Startup Manager Startup Manager allows you to pick a volume to start from while the computer is starting up. Immediately press and hold the Option key. After a few seconds, the Startup Manager appears.

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    Use your mouse or trackpad, or left and right arrow keys to select the volume you want to use.