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.
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