![]() ![]() Two options are to use Duplicate (a free utility which can copy and paste an entire bootable volume), or Mac Backup Guru (a paid, fully featured backup utility with unique incremental backups capability) for that. A backup of the disk before it’s erased.Keep in mind that macOS High Sierra can only be installed onto supported hardware, if you’re uncertain whether or not a particular computer supports the release you can check this list of macOS High Sierra compatible Macs.ĭo you know of another approach to making a macOS High Sierra bootable install drive? Do you have an easier method, or do you have any particular tricks related to this process? Let us know in the comments.What’s needed for a clean install on a Mac If you had previously created a boot installer for the High Sierra beta you may notice the syntax is different for createinstallmedia is different with the final version, part of that is to accommodate the new file name of the application installer, and the remainder removes the necessity of the –applicationpath flag and directive. ![]() Once booted from the USB drive you can proceed with installing macOS High Sierra, using the Disk Utility tools to format or erase a volume, work with Time Machine, and other similar tasks. Select the High Sierra installer at this screen. Immediately on reboot, start holding down the “OPTION” (ALT) key to load the boot menu. With the newly created macOS High Sierra USB installer drive connected to the Mac, reboot the computer. Booting from the macOS High Sierra USB Installer Drive If the file size of the High Sierra installer is not over 5GB then you have the incomplete installer and will need to download the complete macOS High Sierra installer application as described here in order to create a bootable installer drive. * Note: if you are getting a “command not found” error and you are certain your syntax is correct, be sure to check the file size of the “Install macOS High Sierra.app” as found in the /Applications folder. Once you have created the USB boot installer drive for macOS High Sierra, you can either launch it immediately to install macOS High Sierra on the current Mac, reboot and startup from the USB installer drive, or eject it and use it on another Mac. Let the installer complete, when finished you will be informed that the process has completed.Confirm the syntax is exactly as written, then hit the RETURN key and enter the administrator password to start making the High Sierra installer drive *.Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/UNTITLED
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