How to install Mac OS from a USB stick?

How to install Mac OS from a USB stick?
Installing macOS from a USB key has several advantages: it is a solution that can be useful in the event of a failure, if you want to reinstall macOS without an internet connection or to install the OS on several machines in the chain.

To run this tutorial, you will need a USB key or an external hard drive with a capacity of at least 16GB. It is essential to save the files on another disk: the key will be formatted during the tutorial.


Format your USB drive

  1. Simultaneously press the keys Cmd + Space to open Spotlight.

    How to install Mac OS from a USB stick?


  2. Entrez Disk Utility and launch the utility.How to install Mac OS from a USB stick?

  3. Click on the volume to format in the left column and then click on the button Clear.How to install Mac OS from a USB stick?

  4. In the parameter Size, select Mac OS Extended (Journaled) . Rename your USB stick with only one word, All Tied Up.How to install Mac OS from a USB stick?

  5. Wait until Disk Utility finishes formatting the USB drive.How to install Mac OS from a USB stick?

Download the macOS installer

  1. Click on the button Apple at the top left of the screen then on App Store.How to install Mac OS from a USB stick?

  2. In the search bar, enter the name of your current operating system (here, macOS Mojave).How to install Mac OS from a USB stick?

  3. On the operating system page, click Obtain or on the cloud icon.How to install Mac OS from a USB stick?

  4. Click on Download.How to install Mac OS from a USB stick?

  5. Wait while the installer is downloaded.How to install Mac OS from a USB stick?

  6. Once the installer starts, leave it without installing.How to install Mac OS from a USB stick?

Create a macOS installation USB drive

La Terminal window provides the fastest way to easily create a macOS installation USB drive.
  1. Simultaneously press the keys Cmd + Space to open Spotlight.How to install Mac OS from a USB stick?

  2. Entrez Port and run it Port.How to install Mac OS from a USB stick?

  3. You should see this window open.How to install Mac OS from a USB stick?

  4. Copy the following command line, depending on your situation, and then click the Enter key. Note: in the command line, replace "MyUSB" by the name given to your USB key.

    For a macOS Mojave installer:
    sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/MonUSB

    For a macOS Mojave installer from macOS Sierra or earlier:
    sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/MonUSB --applicationpath /Applications/Install macOS Mojave.app

    For a macOS High Sierra installer:
    sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MonUSB

    For a macOS High Sierra installer from macOS Sierra or earlier:
    sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MonUSB --applicationpath /Applications/Install macOS High Sierra.app

    For a macOS Sierra installer:
    sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MonUSB --applicationpath /Applications/Install macOS Sierra.app

    For a macOS El Capitan installer:
    sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MonUSB --applicationpath /Applications/Install OS X El Capitan.appHow to install Mac OS from a USB stick?


  5. Enter your mot de passe administrator.How to install Mac OS from a USB stick?

  6. Press the key Y then Starter.How to install Mac OS from a USB stick?

  7. Wait while the installation files are copied to the USB drive. It may take several minutes.How to install Mac OS from a USB stick?

  8. Once the installation files have been copied, you have a bootable usb stick ready to install macOS.How to install Mac OS from a USB stick?

Install macOS from the USB drive

  1. Click on the menu Apple at the top left of the screen, then on System Preferences.How to install Mac OS from a USB stick?

  2. Click on the menu Boot disks.How to install Mac OS from a USB stick?

  3. Select the disk corresponding to your macOS installation USB driveAnd click To restart.How to install Mac OS from a USB stick?

  4. After restarting, the computer offers you the following menu. Click on Reinstall macOS and follow the steps of the installation process.How to install Mac OS from a USB stick?

Caution : It is strongly recommended that you back up your personal files before reinstalling macOS. You can do this by using Time Machine to create a save point.

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