![]() You’ll need to start with a clean thumb drive or hard drive in order to make it a bootable drive. How to format your external drive for macOS High Sierra Close the installer instead.Īnd please: Don’t forget to back up your Mac before you do anything. Note: After macOS Sierra has downloaded, it will automatically launch the installer to begin the installation process. You’ll also need to download macOS High Sierra from the Mac App Store. How to use macOS High Sierra with a bootable driveīefore you get started, make sure you have a thumb drive with at least 8GB of storage, or a spare external hard drive (one you aren’t planning to use for anything else).How to make your external drive bootable for macOS High Sierra.How to format your external drive for Mac.If you don’t feel comfortable making changes to your Mac with Terminal, you can create a bootable disk using the DiskMaker X program. Note: These instructions require the use of Terminal. You can use a bootable drive on a hard drive partition for dual-software installation, to install on multiple Macs in your home, or as a bootable drive if you can’t use the Internet Recovery partition. When it comes time to upgrade your Mac operating system, the first thing to consider is whether you want to install it directly onto your Mac or create a bootable drive. Make a bootable copy of macOS High Sierra so you can have a portable copy to install on multiple devices.
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