Create Mac Os X Bootable Usb Installer From Dmg

Your USB is now a live, bootable exorcist.

The createinstallmedia command is hidden deep inside the macOS installer app. Open Terminal (/Applications/Utilities/Terminal.app).

The command syntax varies slightly depending on the macOS version. Here are the most common versions:

For macOS Sonoma, Ventura, Monterey, Big Sur, Catalina, Mojave:

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")

For macOS High Sierra, Sierra, El Capitan:

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ macOS\ High\ Sierra.app

Pro Tip: You don't need to type the whole path. Type sudo (with a space), then drag the createinstallmedia file from the .app (Right-click the app > Show Package Contents > Contents > Resources) into the Terminal window. Then type --volume and drag your USB drive (MyVolume) from the Finder sidebar into the Terminal.

In Terminal, use the following template: create mac os x bootable usb installer from dmg

sudo /Applications/Install\ macOS\ [Version].app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

Examples:

Note: For very old OS X installers (e.g., Lion, Mountain Lion), you may need to use a different method or restore the .dmg directly via Disk Utility's Restore feature.

| Issue | Solution | |--------|----------| | Command not found | Check the .app name and path carefully – use Tab key for autocomplete | | "MyVolume" not found | Rename USB to exactly MyVolume (case-sensitive) or adjust the command | | DMG contains only a .pkg | Install the .pkg first, which places the .app into Applications | | .app is hidden in the DMG | Some DMGs have InstallESD.dmg – mount it and use Disk Utility's Restore feature instead | | Old macOS (Lion/Mountain Lion) | Use Disk Utility: drag InstallESD.dmg → select USB → click Restore |

What you need:

Method 1: Using TransMac

Method 2: Using Terminal

Verify the bootable USB installer

By following these steps, you should now have a bootable USB installer for Mac OS X created from a DMG file.

I tested a macOS Catalina DMG (approx 8GB) on a SanDisk Ultra 32GB USB 3.0 drive.

Before you touch the Terminal, gather your supplies:

This is where novices erase their main hard drive. Do not guess.

Create Mac OS X Bootable USB Installer from DMG: A Step-by-Step Guide

Are you looking to create a bootable USB installer for Mac OS X from a DMG file? Perhaps you need to reinstall the operating system on your Mac or want to create a backup installer for future use. Whatever the reason, creating a bootable USB installer from a DMG file is a straightforward process that can be completed with a few simple steps.

In this article, we'll walk you through the process of creating a Mac OS X bootable USB installer from a DMG file. We'll cover the requirements, the step-by-step process, and some troubleshooting tips to ensure that you successfully create a bootable USB installer. Your USB is now a live, bootable exorcist

Requirements

Before you begin, make sure you have the following:

What is a DMG file?

A DMG file is a disk image file used by macOS to distribute software, including operating system installations. It's essentially a compressed file that contains the installation data for Mac OS X. When you download Mac OS X from the App Store, it comes in a DMG file format.

Why create a bootable USB installer?

Creating a bootable USB installer from a DMG file offers several benefits:

Step-by-Step Process

Creating a Mac OS X bootable USB installer from a DMG file involves a few simple steps: