All versions from Mac OS X Snow Leopard (10.6) to macOS Sequoia (15.x) can be turned into bootable USB installers using these methods. However, the createinstallmedia command was officially introduced with OS X Lion (10.7). For older systems (Leopard 10.5 and earlier), the dd raw write method (Method 2) is your only option.
diskutil eject /dev/disk2
A standard macOS installer DMG typically contains one of two things:
Critical Insight: The createinstallmedia command (Apple’s official tool) requires the .app bundle, not a raw DMG. If your DMG contains a .pkg installer, you must run the package first to extract the .app to your Applications folder. create mac os x bootable usb installer from dmg
Open Terminal (Applications → Utilities → Terminal) and run:
ls /Applications/ | grep "Install"
You should see something like Install macOS Sonoma.app or Install macOS Monterey.app.
Note the exact name – you'll need it for the next step. All versions from Mac OS X Snow Leopard (10
Ideally, Apple wants you to download macOS from the App Store as a .app file and use the built-in terminal command createinstallmedia. However, you often end up with a .dmg file if:
The Review Scope: This review looks at the reliability, speed, and usability of turning that DMG into a functional boot drive on a Mac.
Creating a bootable USB installer for macOS from a Disk Image (DMG) file is an essential skill for IT professionals, system administrators, and advanced users. This process allows for clean operating system installations, upgrades across multiple machines without re-downloading, and system recovery when the built-in recovery partition is compromised. This report outlines the prerequisites, step-by-step methodologies (both graphical and command-line), common troubleshooting issues, and best practices. A standard macOS installer DMG typically contains one
sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS\ Installer
Replace /Applications/Install\ macOS\ Monterey.app/ with the path to your .dmg file mounted on your system, and /Volumes/macOS\ Installer with the name of your USB drive.
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS\ Installer --applicationpath /Applications/Install\ macOS\ High\ Sierra.app
Rating: 4.5/5 Stars
This is the modern solution. Tools like BalenaEtcher (free/open source) or UUByte DMG Editor (paid/trial) handle the heavy lifting.