No text will appear in Terminal when you enter the password. This is the password you use to make changes on your Mac or log in. Enter your administrator account password.Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume The name of the drive can't have any spaces and it is case sensitive.Įnter the following text into Terminal ( Don't forget to change the pathname "MyVolume" if your external hard drive is named something else): If it is not named "MyVolume," you will need to change the command syntax for the pathname where it says: MyVolume. Recall the name of your formatted external drive when entering the following text into Terminal.Scroll down and double click on Terminal.
Important:You will need to be in your Mac's administrator account in order to run the sudo Terminal command. Your thumb drive or external hard drive is now ready. Click Done when the process is complete.If Scheme is available, select GUID Partition Map.Select Mac OS Extended (Journaled) from the format list.Rename your external hard drive MyVolume.Scroll down and double-click on Disk Utility.Ĭlick on the Erase tab at the top of the window. Scroll down and double-click on Utilities.Select Applications from the list on the left side of the window. Click on Finder in your Dock to open a Finder window.Plug the USB end of the drive to a USB port on your 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.
#FORMAT AN EXTERNAL HARD DRIVE FOR MAC USING SIERRA HOW TO#
How to format your external drive for Mac
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