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If you're thinking about installing macOS Catalina, the first thing to consider is whether you want to install it directly onto your Mac or create a bootable drive. You can use a bootable drive on a hard drive partition for dual-software installation, to install on multiple Macs in your home, or as a bootable drive if you can't use the Internet Recovery partition.

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Note: These instructions require the use of Terminal. If you don't feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program.

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 you aren't planning to use for anything else). You'll also need to download macOS Catalina and ensure that it's sitting in your Applications folder.

Note: After macOS Catalina has downloaded, it will automatically launch the installer to begin the installation process. Quit the installer when this happens.

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And please: Don't forget to back up your Mac before you do anything.

How to format your external drive for macOS Catalina

You'll need to start with a clean thumb drive or external hard drive in order to make it a bootable drive.

  1. Plug the thumb drive or cable for your hard drive into the appropriate 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.

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  4. Scroll down and double-click on Utilities.

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

  6. Select your thumb drive or external 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 drive with the same name, you will need to rename the drive you are using as a bootable installer now.
  9. If your Mac is using AFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the list of options.
  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 put macOS Catalina onto your external drive

Important: You will need to use an administrator account on your Mac in order to run the Terminal commands to create a boot drive. You'll also need to ensure that macOS Catalina is in your Applications folder and you'll need to know the name of the external drive.

  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/MyVolume. 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' in the text below to the actual name of your external drive. Names are case sensitive and can't have any spacing.): Os x 10.6 4 dmg.

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

  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.

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

How to install macOS Catalina with a bootable installer drive

Once macOS Catalina is installed on your external drive, you can install it on any Mac with the drive plugged into it. You can use this installer to upgrade your operating system easily on multiple Macs or to help downgrade if you decide you want to go back to an earlier version of macOS.

If you're downgrading from macOS Catalina, please check out this guide instead.

If you're upgrading to macOS Catalina, follow the steps below.

  1. Turn off the Mac you want to install macOS Catalina with the bootable installer 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 it starts up.
  5. Select the external drive with macOS Catalina on it from the list of systems to start up your computer.
  6. Follow the installation process when prompted.

Questions?

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

Updated September 2019: Updated for macOS Catalina.

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