Because every modern Mac supports USB-C, and some Macs only feature USB-C, I recommend purchasing a USB drive with a USB-C connector. Simply follow our step-by-step guide for the full details.īefore you begin, you’ll need to acquire a USB flash drive. This hands-on tutorial is valid for both the public and developer beta versions of macOS Big Sur, and will also work with the final version of Big Sur upon its release later this year. Making a bootable macOS Big Sur USB drive is a quick and clean way to install a fresh copy of macOS on your Mac.