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Install Big Sur From External Drive

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How to create a bootable installer for macOS

Y’all can use an external drive or secondary book every bit a startup disk from which to install the Mac operating system.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You lot don’t need a bootable installer to upgrade macOS or reinstall macOS, merely it can be useful when y’all desire to install on multiple computers without downloading the installer each time.

What you demand to create a bootable installer

  • A USB flash drive or other secondary volume formatted every bit Mac Os Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Monterey, Large Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

The installer for macOS Monterey, macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra downloads to your Applications folder as an app named Install macOS [version proper name]. If the installer opens afterwards downloading, quit it without continuing installation. To go the correct installer:

  • Download on a Mac that is compatible with that version of macOS.
  • Download on a Mac that is using macOS Sierra ten.12.5 or later on, or Bone X El Capitan 10.11.vi.
  • Enterprise administrators: Download from Apple tree, non a locally hosted software-update server.

The installer for OS X El Capitan downloads to your Downloads folder equally a deejay image named InstallMacOSX.dmg. To go the installer:

  • Download using Safari, and open up the deejay image on a Mac that is compatible with Bone X El Capitan.
  • Within the disk image is an installer named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You volition create the bootable installer from this app, non from the disk image or .pkg installer.

Utilise the ‘createinstallmedia’ control in Final

  1. Connect the USB flash drive or other volume that you lot’re using for the bootable installer.
  2. Open up Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB wink drive or other volume you’re using. If it has a different proper noun, replace

    MyVolume
     in these commands with the proper name of your volume.

Monterey:*

sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
            

Big Sur:*

sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
            

Catalina:*

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resource/createinstallmedia --volume /Volumes/MyVolume
            

Mojave:*

sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
            

High Sierra:*

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

El Capitan:

sudo /Applications/Install\ Bone\ X\ El\ Capitan.app/Contents/Resource/createinstallmedia --volume /Volumes/MyVolume
              --applicationpath /Applications/Install\ Os\ X\ El\ Capitan.app
            

* If your Mac is using macOS Sierra or earlier, include the--applicationpath argument and installer path, similar to the manner this is done in the command for El Capitan.


Afterwards typing the control:

  1. Press Return to enter the control.
  2. When prompted, type your ambassador password and press Return again. Terminal doesn’t show any characters equally you type your countersign.
  3. When prompted, typeY to confirm that yous desire to erase the volume, so press Return. Last shows the progress as the book is erased.
  4. After the volume is erased, you lot may come across an alert that Terminal would similar to access files on a removable volume. Click OK to allow the copy to go along.
  5. When Terminal says that it’s washed, the volume will have the same name as the installer you downloaded, such as Install macOS Monterey. Y’all can now quit Last and squirt the volume.

Use the bootable installer

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and uniform with the version of macOS you’re installing.
    • The macOS version that came with the Mac is the earliest version information technology can use.
    • A bootable installer doesn’t download macOS from the cyberspace, but it does require an internet connection to become firmware and other information specific to the Mac model.
  2. Turn on the Mac and continue to agree the ability button until y’all see the startup options window, which shows your bootable volumes.
  3. Select the volume containing the bootable installer, and then click Proceed.
  4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you’re installing.
    • The macOS version that came with the Mac is the earliest version information technology can use.
    • A bootable installer doesn’t download macOS from the internet, but it does crave an internet connection to become firmware and other information specific to the Mac model.
  2. Press and hold the Option (Alt) ⌥ cardinal immediately after turning on or restarting the Mac.
  3. Release the Option key when y’all see a nighttime screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the upwardly arrow or printing Return.
    If you can’t start up from the bootable installer, make sure that Startup Security Utility is set to permit booting from external or removable media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install Os X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more than

For data about the
createinstallmedia control and the arguments you can use with information technology, brand sure that the macOS installer is in your Applications binder, so enter the appropriate path in Concluding:

/Applications/Install\ macOS\ Monterey.app/Contents/Resource/createinstallmedia
            
/Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia
            
/Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia
            
/Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia
            
/Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia
            
/Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resource/createinstallmedia
            

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Source: https://support.apple.com/en-us/HT201372