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In the worst case scenario, you might need to reinstall macOS on the external volume.

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Weve already covered some of them in detail, such as using built-in Startup Manager to pick a disk to startup your Mac from and booting into Safe, Verbose and Target Disk modes.

In this article, we get to talk about starting your Mac up from external storage like optical media or an external USB-based hard drive or flash storage.

Booting from an external storage allows you to start up your Mac in another version or copy of macOS, Additionally, it can help you troubleshoot certain issues, and more.

Apple advises against booting from external storage containing a version of macOS earlier than the one your Mac shipped with.

How to start up your Mac from a bootable CDDVD 1) Firstly, turn on your Mac, or restart it if its already on by choosing Restart in the Apple menu.

Secondly, press and hold the C key on your keyboard immediately upon hearing the startup chime.

Your Mac should start up from the macOS installer CDDVD media.

Tip: You can easily burn a bootable image of macOS to a DVD using Disk Utility.

How to start up your Mac from an external USB storage device If your USB thumb drive, USB external disk or flash storage contains a usable operating system or a macOS installer, you can select it at boot time using macOS built-in feature called Startup Manager, which can be invoked via a simple keystroke.

Turn on or restart your Mac.

Press and hold the Option key immediately upon hearing the startup chime.

Startup Manager will scan and list connected drives and volumes that can be booted from, as shown below.

Highlight the volume you want to use by using your mouse or trackpad, or left and right arrow keys on the keyboard.

Double-click or press the Return key to boot your Mac from the selected volume.

Tip: If there are several USB storage devices connected to your Mac, Startup Manager will only list the ones containing bootable volumes.

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Full tutorial: how to pick a startup disk for your Mac at boot time.

How to start up your Mac from an external volume using System Preferences You can use System Preferences to tell your Mac to automatically use optical media or an USB-based external disk or flash storage every time its restarted.

Open the System Preferences application in the Dock.

Now click the Startup Disk pane.

You will be presented with various disk icons.

Select the system you would like to use to start your computer up.

Now click the Restart button to start up your Mac using the chosen volume.

Tip: Your Mac will now always boot into the selected startup disk.

Full tutorial: how to choose a startup disk using System Preferences.

Troubleshooting startup issues Should you run into problems whilst attempting to boot your Mac from an external storage device, consult our FAQ below.

It will help troubleshoot any start up issues you may be plagued with.

Is the storage device to an external power supply Depending on its model and power requirements, it may be necessary to connect your USB storage device to an external power supply.

Is the storage device connected and turned on Make sure your external storage is turned on and connected to your Mac.

USB-based external hard disks usually have the power onoff button at the back of the enclosure.

Does your disk need repair If your Mac doesnt boot from an external volume or the drive doesnt show up in Startup Manager even though it contains a bootable copy of macOS, it might need repair.

The first order of business should be attempting to repair disk permissions in Disk Utility.

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