How to Make a Bootable macOS Catalina USB Install Key

How to Make a Bootable macOS Catalina USB Install Key

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These are instructions on how to make a bootable USB install key for macOS Catalina.

Step One
Connect a 16GB or larger USB key to your computer then launch the Mac App Store from your dock.
How to Make a Bootable macOS Catalina USB Install Key

Step Two
Navigate to the macOS Catalina application page and click the Get button.
How to Make a Bootable macOS Catalina USB Install Key

You may be brought to a Software Update window, click Upgrade Now to begin downloading the update.
How to Make a Bootable macOS Catalina USB Install Key

Once the installer launches, press the Command+Q keys on the keyboard to exit.
How to Make a Bootable macOS Catalina USB Install Key

Step Three
Open your Applications folder and select the 'Install macOS Catalina app. Press Command+i on the keyboard and verify its size.
How to Make a Bootable macOS Catalina USB Install Key

If it's over 5GB, skip to the next step. If it's tiny (~20MB), you can either run it to install macOS Catalina and then redownload the installer or delete it, upgrade to the latest version of Mojave from the Mac App Store, then redownload the installer.
How to Make a Bootable macOS Catalina USB Install Key

Step Four
Once you've verified that you have the full installer, launch Terminal from the Applications:Utilities folder.
How to Make a Bootable macOS Catalina USB Install Key

Step Five
Note the name of your USB key.
How to Make a Bootable macOS Catalina USB Install Key

Execute the following command in the Terminal window replacing 'Untitled' with the name of your USB key. Please note this will erase the entire USB key.

sudo '/Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia' --volume '/Volumes/Untitled'
How to Make a Bootable macOS Catalina USB Install Key

You will be asked to enter your Administrative account password.
How to Make a Bootable macOS Catalina USB Install Key

Type Y and press enter to begin.
How to Make a Bootable macOS Catalina USB Install Key

Step Six
After about 30 minutes the creation of your USB Install Key for macOS Catalina will be complete.
How to Make a Bootable macOS Catalina USB Install Key

Step Seven
You may now restart your Mac and hold down the Option key after hearing the boot sound. You'll be presented with a list of bootable drives. Select the USB install key to begin.
How to Make a Bootable macOS Catalina USB Install Key


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