The command syntax varies slightly depending on the macOS version. Here are the most common versions:
Creating a bootable USB installer for macOS is an essential skill for IT professionals, developers, and everyday Mac users. Whether you need to perform a clean install, downgrade your operating system, troubleshoot a corrupted drive, or install macOS on multiple machines, a bootable USB drive is your most reliable tool. create mac os x bootable usb installer from dmg
While most online tutorials focus on using the createinstallmedia command with an Install macOS.app downloaded directly from the Apple App Store, what do you do when all you have is a .dmg file? Perhaps you downloaded a beta version, recovered an older OS from an archive, or received an installer from a colleague. The command syntax varies slightly depending on the
diskutil list Look for your USB drive. It will look something like /dev/disk2 (external, physical) . Note the identifier (e.g., disk2 ). Step 2: Unmount the Drive (But keep it connected) diskutil unmountDisk /dev/disk2 (Replace disk2 with your identifier) Step 3: Write the DMG to the USB Use the dd command (disk duplicator). Be extremely careful. While most online tutorials focus on using the
This method is extremely powerful. If you write to the wrong drive, you will lose data irrecoverably. Step 1: Identify the USB Drive Open Terminal and run:
sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Replace "Sonoma" with your actual OS name, e.g., "Ventura", "Monterey", or "Big Sur")