Replace diskN with the correct disk number (e.g., /dev/disk2).
the exact identifier disk number (e.g., disk2 , disk3 , or disk4 ). ⚠️ Critical Warning: Double-check this identifier. Selecting the wrong disk number will completely overwrite your Mac's internal hard drive. Unmount and Burn the Image
Creating a bootable macOS USB installer from a DMG file is a crucial task for system administrators, tech enthusiasts, and users looking to perform a clean installation or rescue a malfunctioning Mac. While Apple officially recommends using the createinstallmedia tool via the Terminal with an installer app, you often find yourself with only a raw DMG file—especially when working from an older archive or a non-Mac system.
Double-check the syntax in Terminal. Ensure that spaces in application names are properly escaped with a backslash ( \ ) and verify that your USB drive is exactly named what is written in the command path. create mac os x bootable usb installer from dmg
The disk image for the version of macOS you wish to install (e.g., Big Sur, Monterey, or Sonoma).
Insert the USB drive and identify it:
for each major macOS version you support. Replace diskN with the correct disk number (e
MyVolume (You can change this, but keeping it makes the Terminal command easier). Format: Mac OS Extended (Journaled) . Scheme: GUID Partition Map . Click Erase , then click Done . Step 2: Extract the Installer App from the DMG
Are you working with a version or a legacy OS X release like El Capitan or Lion?
macOS cannot boot from a drive unless it uses the correct partition scheme and file system. Insert your USB flash drive into your Mac. Selecting the wrong disk number will completely overwrite
The syntax generally looks like this: sudo /Applications/Install\ macOS\ [Name].app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Use code with caution. Press .