In the Startup Security Utility screen, you will see the option for external boot disabled. The process is different from that of Intel Macs and requires users to follow a few steps to use external startup disks. While there have been a lot of tutorials and videos on how to use an external disk to boot for T2 Macs, there are not many guides to do the same for M1 Macs. When your internal disk has problems and you are not able to securely boot your macOS from it, you may need to rely on an external backup to continue your work without disruptions. The reason that one may want to use an external disk like a USB or hard disk to boot from is due to unforeseen catastrophic internal disk failures. However, the process to use an external disk to boot from in case of emergencies still requires a few careful steps to be followed. Since the need for a separate chip is no longer required, Apple has moved the secure enclave inside the M1 and M2 Chip. In the case of the Apple ARM Macs, the T2 security chip is no longer present. Please follow iClarified on Twitter, Facebook, Google+, or RSS for more Apple news, tutorials, and videos.The presence of a T2 security chip in Intel Macs gets in the way of trying to use external drives to boot from. You'll be presented with a list of bootable drives. You may now restart your Mac and hold down the Option key after hearing the boot sound. If prompted to allow Terminal to access your removable device, click OK.Īfter about 30 minutes the creation of your USB Install Key for macOS Big Sur will be complete.
You will be asked to enter your Administrative account password.
Sudo '/Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia' -volume '/Volumes/Untitled' Please note this will erase the entire USB key. Once you've verified that you have the full installer, launch Terminal from the Applications:Utilities folder.Įxecute the following command in the Terminal window replacing 'Untitled' with the name of your USB key. If it's tiny (~20MB), you can either run it to install macOS Big Sur and then redownload the installer, or delete it, upgrade to the latest version of Catalina from the Mac App Store, then redownload the installer. If it's over 10GB, skip to the next step. Press Command+i on the keyboard and verify its size. Open your Applications folder and select the 'Install macOS Big Sur' app.
Once the installer launches, press the Command+Q keys on the keyboard to exit. You may be brought to a Software Update window, click Upgrade Now or Download to begin downloading the update. Navigate to the macOS Big Sur application page and click the Get button.
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