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Then the system will launch from that device every time. Regardless of the operating system you are using, booting your machine from USB media does not need to be difficult. A general understanding how your system loads can provide the basics needed to understand what is going on when you use boot media.

It provides guidance that is specific to the iteration of OS X you are running i. Sierra, High Sierra, Yosemite, etc.

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Windows and Linux users might consider Acronis Disk Director 12 , which includes an intuitive Boot Media Builder that streamlines the process and offers tremendous flexibility for the type and kind of boot media you can create, including WinPE media. All rights reserved. Acronis Disk Director Learn more day free trial. Once the Startup Manager screen appears, release the Option key.

How to Change Mac Snow Leopard’s Startup Disk Preferences - dummies

The utility will look for any available drives that include bootable content. Using either the pointer or arrow keys on the keyboard, select the USB drive you wish to boot from. Once selected, either hit the Return key or double-click your selection.

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The machine will start to boot from the USB drive. Depending on the company that created your version of BIOS, a menu may appear. All of the available system devices will be displayed in order of their boot priority.

How to boot your mac from a USB bootable device

You can reorder the devices here. The machine will start to boot from the USB drive. 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. 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.


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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.