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Connect the USB thumb drive to the Mac, name the drive something obvious like “BigSurUSB”.Download macOS Big Sur if you haven’t done so already.Backup your Mac and proceed at your own risk. Use exact syntax at the command line, as failure to do so can result in erasing the wrong volume. How to Create a Bootable macOS Big Sur Install Drive

If you’re not comfortable with the command line, you can also use a tool like MDS to download installers and create boot disks with. If you’re not familiar with the command line, be sure to backup the Mac first, and to follow the instructions exactly. MacOS Big Sur compatible Mac to download and create the installer, and to install ontoīe aware this requires using the command line.A USB thumb drive (16GB minimum) – this will be formatted to become the macOS Big Sur installer.The “Install macOS Big Sur.app” installer application in the /Applications/ folder ( downloaded (you can re-download it if you need to from Big Sur).Whatever the reason you want one, let’s check out the process of making a bootable installer drive for macOS Big Sur.īefore getting started, you will need the following: There are many useful reasons to have a bootable installer USB drive for macOS Big Sur, whether to perform updates, installs, clean installs, install onto multiple machines, have as a troubleshooting tool, and so much more.