Execute the following command, replacing Untitled with your USB drive's exact name, and VersionName with your specific macOS version (e.g., Catalina , HighSierra , or ElCapitan ):
Inside the mounted volume, look for one of two things:
the Flash from file button and select your raw Mac OS X DMG file.
The command syntax varies slightly depending on the macOS version. Here are the most common versions:
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Use code with caution.
Our goal is to take that DMG and write it to a USB drive so that your Mac can recognize it as a startup disk.
This installer package does not install the OS on your computer; instead, it extracts the actual application (e.g., Install OS X El Capitan.app ) directly into your folder. Step 3: Use the Native Terminal createinstallmedia Tool
Open Terminal and use the createinstallmedia command. For example, for macOS Sonoma: sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Replace "MyVolume" with the actual name of your USB drive) . 3. Method B: Using Windows (Recovery Scenario)
If you have an ISO file (converted from DMG as shown in the prerequisite) or a raw DMG, is a user-friendly, open-source tool that simplifies the process.
Option Key (Intel) or Power Button (Apple Silicon). If you're interested, I can also provide:
diskutil unmountDisk /dev/diskN
Browse to find your downloaded Mac OS X .dmg file, select it, and click .
The sync command ensures all data is physically written before ejecting.
If you already have a functioning Mac, using the built-in is the most reliable and officially supported method. 1. Prepare the USB Drive
If you need help troubleshooting a specific error code during conversion or want to know if your specific Mac hardware model is compatible with older OS X versions, let me know! Share public link
Apple's preferred method involves converting the DMG content into a formal installer application before using the Terminal to write it to a drive.
Execute the following command, replacing Untitled with your USB drive's exact name, and VersionName with your specific macOS version (e.g., Catalina , HighSierra , or ElCapitan ):
Inside the mounted volume, look for one of two things:
the Flash from file button and select your raw Mac OS X DMG file.
The command syntax varies slightly depending on the macOS version. Here are the most common versions:
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Use code with caution. create mac os x bootable usb installer from dmg
Our goal is to take that DMG and write it to a USB drive so that your Mac can recognize it as a startup disk.
This installer package does not install the OS on your computer; instead, it extracts the actual application (e.g., Install OS X El Capitan.app ) directly into your folder. Step 3: Use the Native Terminal createinstallmedia Tool
Open Terminal and use the createinstallmedia command. For example, for macOS Sonoma: sudo /Applications/Install\ macOS\ Sonoma.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Replace "MyVolume" with the actual name of your USB drive) . 3. Method B: Using Windows (Recovery Scenario)
If you have an ISO file (converted from DMG as shown in the prerequisite) or a raw DMG, is a user-friendly, open-source tool that simplifies the process. Execute the following command, replacing Untitled with your
Option Key (Intel) or Power Button (Apple Silicon). If you're interested, I can also provide:
diskutil unmountDisk /dev/diskN
Browse to find your downloaded Mac OS X .dmg file, select it, and click .
The sync command ensures all data is physically written before ejecting. Our goal is to take that DMG and
If you already have a functioning Mac, using the built-in is the most reliable and officially supported method. 1. Prepare the USB Drive
If you need help troubleshooting a specific error code during conversion or want to know if your specific Mac hardware model is compatible with older OS X versions, let me know! Share public link
Apple's preferred method involves converting the DMG content into a formal installer application before using the Terminal to write it to a drive.