Create Usb Boot Drive For Mac High Sierra

To install macOS or OS X from USB, you need to create a bootable install USB drive for Mac operating system. This tutorial will introduce you three ways to create bootable USB drive for macOS High Sierra, macOS Sierra, Mac OS X El Capitan, Yosemite, Mavericks and more. How to create a bootable USB installer for macOS High Sierra 1. Insert the USB flash drive into a USB port. Note the drive's volume name when mounted in the Finder. Launch the Terminal and enter the following command to format and extract the macOS High Sierra files to your USB drive ( Figure A.

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Easy and fastest way to create installable bootable macOS High Sierra USB Flash Drive for Clean Installation in any mac

Comment créer un pilote d’installation USB Bootable MacOS High Sierra pour une installation propre

So erstellen Sie macOS High Sierra bootfähiges USB Installationslaufwerk für saubere Installation

macOS High Sierraブート可能USBを作成する方法クリーンインストール用ドライブをインストールする

如何创建macOS High

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Open destination folder and locate file notes.txt, open it and read step by step.

Don’t forget to read instructions after installation.
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If you are planning to install macOS Catalina, there is one additional set of steps you should follow. You should download a bootable copy of macOS Mojave. This is the only way to downgrade if you decide you're not ready for macOS Catalina.

Before you start

Before you get started, make sure you have a thumb drive with at least 15GB of storage, or a spare external hard drive (one that you don't use with anything else).

You'll also need to download macOS Mojave from the Mac App Store.

Note: After macOS Mojave has downloaded, it will automatically begin the installation process. Close the installer instead.

Please, Please, Please, backup your Mac before you do anything.

How to format your external drive for Mac

You'll need to start with a clean thumb drive or hard drive in order to get it ready to work as a bootable drive.

  1. Plug the USB end of the drive to a USB port on your Mac.
  2. Click on Finder in your Dock to open a Finder window.
  3. Select Applications from the list on the left side of the window.

  4. Scroll down and double-click on Utilities.
  5. Scroll down and double-click on Disk Utility.

  6. Select your drive under External.
  7. Click on the Erase tab at the top of the window.

  8. Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external hard drive named 'Untitled,' you will need to rename your hard drive now.
  9. If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the format list.
  10. If Scheme is available, select GUID Partition Map.
  11. Click Erase.
  12. Click Done when the process is complete.
  13. Close the Disk Utility window.

Your thumb drive or external hard drive is now ready.

How to make your external drive bootable for installing macOS Mojave

Important:You will need to be in your Mac's administrator account in order to run the sudo Terminal command.

  1. Click on Finder in your Dock to open a Finder window.
  2. Select Applications from the list on the left side of the window.

  3. Scroll down and double-click on Utilities.
  4. Scroll down and double click on Terminal.

  5. Recall the name of your formatted external drivewhen entering the following text into Terminal. If it is not named 'Untitled,' you will need to change the command syntax for the pathname where it says: Volumes/Untitled. The name of the drive can't have any spaces and it is case sensitive.
  6. Enter the following text into Terminal (Don't forget to change the name 'Untitled' if your hard drive is named something else):

    sudo /Applications/Install macOS --volume /Volumes/Untitled

  7. Hit the enter/return key.

  8. Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password.
  9. Type Y to confirm that you want to erase the drive and press return.

The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.'

Create a bootable usb drive for mac high sierra

How to use macOS Mojave as an installer boot drive

Once macOS Mojave is installed on your external drive, you can boot up and install any Mac with the drive plugged into it.

  1. Turn off the Mac you want to install macOS Mojave with the bootable drive.
  2. Connect the external drive to your Mac via the USB port.
  3. Turn on your Mac.
  4. Hold down the Option key when you hear the startup chime.
  5. Select the external drive with macOS Mojave on it from the list of systems to start up your computer.

The installation process will begin. Follow the steps to install macOS Mojave onto your Mac or partitioned hard drive.

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Do you have any questions about how to create a bootable installer drive for macOS Mojave? Let us know in the comments.

Updated September 2019: Updated for macOS Catalina.

macOS Catalina


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