Create Bootable Usb From Dmg Download Or Install

We will need a copy of the installer dmg (not provided) and a 4GB USB Thumbdrive or Memorycard Reader wmemory card and a Mac to convert the dmg to a bootable usb thumb drive.

We can then boot the USB Drive on our Mac to install OS X Lion from it.

This is very handy for us Macbook Air users that do not have an external optical drive.

Once its finished, you now have a bootable OS X Lion install thumbdrive (basically just like what the Macbook Air ships with).

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Maybe youve got multiple Macs and a limited amount of bandwidth, and dont want to download the entire operating system for every system.

Or maybe youre looking to install the operating system from scratch.

If your drive is larger than 8GB, and youd like to use the rest of the drive for something else, you could use Disk Utility to partition the drive: just create an empty, 8GB partition for the installer.

Create Bootable Usb From Dmg Download Or Install

If what youre looking for is the latest version of macOS, search for that operating system and click the Download or Install button.

The installer will load when the process is done; simply close the window, then head to your Applications folder to confirm the installer is there.

Instead, youll have to head to the Purchases tab in the installer and scroll down until you find the version of macOS you want on your thumb drive.

Click the Download button to the left of the release you want to install, and your Mac will download it.

Again, the installer will launch when the download is complete; close the window when this happens.

There are two ways to do this: one with third party software, and another with the Terminal.

Generally, the latest version supports only the latest version of macOS; if you want to install something older than macOS High Sierra, check the list of older versions and download one thats compatible with your chosen operating system.

If youve put the installer somewhere besides the Applications folder, you can direct DiskMaker X to the file manually.

Choose the drive or partition, knowing that it will be completely overwritten.

When the process is done youll hear a loud lion roar (seriously, it freaked me out), and youll see the completed drive.

The Terminal method, outlined below, does not include these.

To summarize: there is a script, called createinstallmedia, included in every macOS installer, and were going to run it.

Open the Terminal, which you can find in Applications Utilities, and run the following command.

Note that the exact command will vary depending on which version of macOS youre trying to install; this one is specific to Sierra.

For macOS Sierra, this is ApplicationsInstall macOS High Sierra.app.

First the disk will be deleted, then the entire installer will be copied to your disk.

The installer for macOS will boot from it, at which point you can upgrade macOS, or install a fresh version.

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