How to create a Bootable USB for Mac OS X High Sierra with Terminal
This tutorial shows how to create a bootable USB installer for macOS High Sierra using the Terminal on a Mac. It’s useful for clean installations or repairing your system.
Steps overview:
Download macOS High Sierra from the App Store or Apple’s website.
Insert a USB drive (at least 16GB) and rename it — for example, Untitled.
Open Terminal and type the createinstallmedia command, such as:
Press Enter, type your admin password, and wait for the process to complete.
When finished, your USB drive becomes a bootable installer for macOS High Sierra.
This method gives you a reliable USB installer that can be used to install or restore macOS on any compatible Mac.