Some Mac users may wish to create a bootable MacOS Catalina installer drive, typically using a USB flash drive or with another similar small boot disk.

Bootable USB installers offer an easy way to upgrade multiple Macs to macOS Catalina, to perform clean installs of MacOS Catalina, to perform maintenance from a boot disk like formatting disks, modifying disk partitions, and performing restorations, and much more.

We’ll walk through how to create a boot USB install drive for MacOS Catalina 10.15.

Requirements to Create a Bootable macOS Catalina USB Install…