![]() Open Terminal by following Applications → Utilities → Terminalģ. Make sure that you have the installation files on your Mac before trying this step out. Use Terminal to create a bootable installerĪnother way to create a bootable installer for macOS is to use Terminal. You can run this OS when you connect the disk to your Mac-the Mac itself will keep its operating system. ![]() Now your flash drive runs the version of macOS that you want. Click Continue and wait for the installation to be complete It’s set on your internal hard drive by default-click on Show All Disks and choose your macOS USB drive insteadĩ. Click past the license agreement until you reach the page asking you which disk you want to install the OS on. Open the macOS installer that you downloaded earlierĨ. Choose OS X Extended (Journaled) for format and GUID Partition Map for schemeħ. Before formatting the disk, make sure it’s backed upĦ. In the sidebar on the left, click on your disk nameĤ. Open Disk Utility by following Applications → Utilities → Disk Utilityģ. ![]() To install macOS on an external hard drive:Ģ. Now that you have the installation files ready on your Mac, you can move them to your USB drive for future use. Create bootable USB drive with Mac Disk Utility As well as updating macOS, your Mac will download an installer file to your Applications folder, which you can use to create your bootable USB drive. If there’s a new version of macOS, click Upgrade NowĤ. Open System Settings, and go to the General sectionģ.You can also find the installer files on your Mac after they’ve been automatically downloaded by macOS Software Update. From there, you can get links to macOS versions in the App Store (High Sierra and upwards), or you can download disk images directly (Lion to Sierra). If you have a more recent version of macOS, then you’ll need to go to Apple’s official website. In older versions of macOS, you could find all the previous installers in the list of purchased apps in your App Store account. You can create a bootable installer for any operating system if you have the right installer. In this case, the system will be installed on that Mac, and the installation files will disappear when the process is finished. If, however, you only want to reinstall macOS once on one computer, you don’t have to use a carrier. You might want to keep installing files on an external drive if you think you might need to install the operating system multiple times or on different computers. In the following instructions, we will use a USB flash drive as an external carrier example. Give your disk the name of the operating system, e.g., Ventura, Monterey, Big Sur. ![]() That means you’ll need to grab yourself a 16GB or larger flash drive before you get started.īear in mind - when you download an installer, the disk will be reformatted to suit the operating system you’re trying to run. Ventura’s installer is over 12GB, as was Montereys, and Big Sur’s topped 13 GB. It’s important to use a drive with enough capacity to fit macOS. Generally, though, USB flash drives are favored - they’re small, convenient, affordable, and easy to work with.
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