Generally speaking, a bootable installer for macOS is an external storage media with a version of macOS installed. Essential preparations before creating a bootable installer When do you need a bootable macOS installer If you’re having problems with your computer, check out our guide on how to factory reset a Mac. Now that you know how to make a bootable USB on a Mac, you can use it to install an OS on a computer without having to download it from the App Store. Finally, quit Terminal and eject the USB.If you open the drive in Finder, you will see the installer. The USB will have the same name as the installer you downloaded. When Terminal says the process is done, that means the drive has been created. This will start the bootable drive creation process. Be sure to check the name and path of your USB key before pressing the key. Hit the Y key on your keyboard when prompted.
Note: Terminal does not show the characters as you’re typing in the password. Use the same password you use to sign in to your Mac.
When prompted, enter your admin password and then hit Enter on your keyboard. 
Hit Enter on your keyboard after typing in the command. High Sierra sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/MyUSB Mojave sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/MyUSB You need to replace “ MyUSB” with the name of your USB drive, or you can rename your drive “ MyUSB.” You can find the name of your USB drive in the left sidebar of a Finder window.Ĭatalina sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/MyUSB Type in the following commands, depending on your version of macOS. Open a Finder window and go to Applications. If you want to find out how to format your hard drive for Mac, check out our guide here. You will also have to format your disk as Mac OS Extended. Note: If your USB drive is not blank, the contents will be completely erased in the next steps. Insert a USB drive into your Mac’s USB port. Click Install macOS Catalina in the top-left corner of your screen. Quit the Installation before clicking Continue. You will know the download is complete when you see an installation window for the macOS appear. Then click Download in the pop-up window. Then click View when you find the right OS. Before that, there was Mojave, High Sierra, Sierra, El Capitan, Yosemite, and Mavericks. Search for the OS you want to install on your bootable USB. Then click Applications in the left sidebar of the Finder window that opens. You can do this by clicking the Finder icon in your Dock.
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