I erased the Volume Group in that container using Disk Utility. ![]() One important point here is don’t attempt to do any of this with 12.0, as it could well fail miserably. One happened to be Monterey 12.0, which I was only too happy to sacrifice for this purpose. ![]() ![]() My starting point wasn’t a freshly formatted disk, but a SATA/USB-C SSD which has already been divided up into multiple containers (partitions) containing bootable versions of macOS. Total time taken should be a few minutes, plus the time required to install macOS on the external disk. As a sequel to my article about the basic principles of using an M1 Mac, this explains how to set up a bootable external disk in Monterey on an M1 Pro. I’m therefore surprised that users still contact me claiming that they’ve had problems with more recent versions of macOS, including Monterey, and with the new M1 Pro and Max models. You can format the drive and then go back to the Recovery menu and install macOS Monterey.In the early days of the original M1 Macs and versions of Big Sur prior to 11.4, installing and setting up a bootable copy of macOS on an external disk was unreliable and often failed. If you want to erase your disk first, to do a clean install, quit the installer and run Disk Utility from the Recovery menu. After selecting it, your system will boot off your USB drive and enter macOS Recovery with the macOS Monterey installer appearing on your screen. You should now see an option to select your USB drive as a startup disk. To boot an M1 or M2 Apple silicon Mac using a bootable USB disk, power on the system or restart it if it’s already on, and keep the Power button pressed down. Power on the system, or restart it if it’s already on, and immediately press and hold the Option key when it starts booting. Simply plug your created USB drive into an open USB port on your Mac. There are two different methods to boot your Mac from a bootable USB, depending on which processor your Mac has. You can use Time Machine to easily back up the data on your Mac. This almost always results in a Mac running faster after a clean install, since macOS has started over with a clean slate.īefore you reinstall macOS on your Mac, make sure you’ve backed up all your important data! This is crucial when you do a fresh installation, as it will wipe your hard drive. A clean installation allows you to get rid of junk apps and files that may have accumulated over time. These issues include when your Mac refuses to boot or when you need to recover system files that seem to be lost.Īnother benefit of using a bootable disk for a macOS installation is that you can perform a clean installation. You can also use the built-in recovery tools that come with the macOS installer to troubleshoot and fix different kinds of issues. This can save quite a bit of time, considering the most recent versions of macOS have an installer size of 12GB. ![]() Why Would You Need to Install macOS From a USB?Ĭreating a bootable USB drive and using it to reinstall macOS is a bit of a lengthier process compared to simply updating macOS from the Software Update section of the System Preferences, but it has its benefits.īut creating a bootable USB disk allows you to install or update macOS on multiple systems without having to download the installer on each Mac.
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