![]() In the Terminal window that opens, enter one of the following commands, depending on which macOS installer you’re working with. Or, type Terminal into Spotlight Search to quickly open a Terminal window. Go to Applications > Utilities and open Terminal. If it does, quit it without continuing installation. The installer may try to open after it’s been downloaded. ![]() ![]() They’ll be called Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. Installers for each of these macOS versions download directly to your Applications folder. Catalina, Mojave, and High Sierra #įrom the Mac App Store, download Catalina, Mojave, or High Sierra. The process differs slightly for different versions. The next step is to download the operating system for which you want to make a backup and move it to your USB drive. Your USB flash drive is now prepared to become a bootable OS X or macOS installer. When it’s finished, select Done and quit Disk Utility. Select Disk Utility and then select Continue.įrom the list of drives attached to your Mac, select your USB flash drive and then select Erase.įrom the Format drop-down menu, select Mac OS X Extended (Journaled), and then select Erase.ĭisk Utility will format your flash drive. When you see the Utilities window, startup is complete. When you see a startup screen, such as an Apple logo or spinning globe, release the keys. Restart your Mac and immediately press and hold Command + R. With your USB drive plugged in, start up your Mac from macOS Recovery. If it’s not already in the right format, here’s how to format your USB flash drive: Make sure whatever USB drive you select is formatted as Mac OS Extended. If your budget allows, a flash drive larger than 16 GB certainly won’t hurt. A 16 GB flash drive is big enough to install a complete copy of the macOS along with recovery utilities, such as Data Rescue, Drive Genius, and TechTool Pro, that you’d find helpful in an emergency bootup situation. ![]() Apple recommends using at least a 12 GB flash drive as a bootable installer, but a 16 GB flash drive might be worth the extra money. ![]()
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