How to Create a Bootable USB Installer for macOS High Sierra

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The standard procedure for updating to a new macOS version is simply installing it over the existing version. It's simple to do and guarantees you'll have access to your data and applications as soon as possible. All your data is still there, but so are the unnecessary applications and files you hoard.

As a result, there are occasions when doing a fresh installation is the best option. If the accumulation of trash files has severely impacted your Mac's performance, or if you're planning to give your Mac to someone else and want to ensure that all of your data has been erased, then you should consider performing a thorough cleanup.

Or perhaps you're nostalgic for the days when your Mac was brand new. There is no motivation; here's how to make an installer for macOS High Sierra.

When Is A Bootable macOS Installation Required?

While a Mac outshines the competition because of its superior performance and user-friendliness, any computer is subject to occasional malfunctions; even your fully loaded Mac, for example, could fail to boot up. If the MacBook Pro fails to start from its internal hard drive, you may get it back up and running by booting it from a USB stick with a bootable macOS installation. A bootable macOS installer is useful for more than just fixing a broken Mac; it may also be used to install an older version.

How to Create A Bootable USB Installer for macOS High Sierra

Method 1. Using the Terminal command

macOS offers an way to create bootable installer for macOS. You need to run Terminal and type the command to do the job. A bootable USB drive for macOS High Sierra may be created by following these steps:

Step 1: Get the latest version of High Sierra from the Mac App Store. When the download is complete and the installer is launched, ensure it remains in the /Applications folder before closing it. Please transfer it to the Applications folder if it is located elsewhere on your computer. Leaving the file name unchanged will make this instruction somewhat less complicated.

Step 2: Put in a USB drive larger than 8 GB. Launch the Disk Utility program and format the stick as a GUID Partition Map and Mac OS Extended (Journaled) if it is not already formatted as such. Doing this action will permanently delete all information from the storage device.

Step 3: USB will be the name of the flash disc. As a result, following the tutorial will be a little less challenging. Verify that no additional volumes with the same name are already mounted.

Step 4: To copy the installer to the flash device and enable it to boot, open a Terminal window and enter the following command:

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/UNTITLED && say Boot Installer Complete

Replace 'UNTITLED with your USB drive name if necessary.

Step 5: Just hit Enter to execute the program, and if required, provide your administrator password.

Step 6: The USB device will be unmounted during the operation and vanish from the computer's desktop. The terminal will update you on the status, so wait patiently.

Step 7: The USB device will return to the desktop after the data have been copied and bootable and the Terminal will notify you that the operation is complete.

Method 2. Create bootable installer with Donemax Disk Clone

There is another way to create bootable installer for macOS High Sierra and newer macOS systems. You can use the software Donemax Disk Clone for Mac. The software provides the feature to make a bootable installer for macOS in a quick way.

Here are the simple steps to create the bootable USB installer for macOS High Sierra with Donemax Disk Clone for Mac:

Step 1: Select Make Installer option. Then choose macOS Hish Sierra from the drop-down list for macOS versions. It will go to App Store and there you can click "Get" to download the operating system installation file. If you have downloaded the installation file manually, you can choose the file manually from the Option 2.

Step 2: Once the download is done, click the Refresh button and the software will show the downloaded installation app. Select an external drive or USB flash drive. Ensure to select an empty drive as the process will format the drive.

Step 3: Click Create a macOS installer button to start make the drive as a bootable macOS installer.

Conclusion:

The ability to install macOS High Sierra via a USB installer eliminates the need to download the installer numerous times from the Mac App Store, making it ideal for situations in which you want to do a clean install or deploy the operating system to many Macs.

Save the USB drive securely if you need to use it for troubleshooting. If your Mac crashes and you can't get it to start up in Recover Mode, you can still use the USB drive to reinstall the OS or access utilities like Disk Utility and Terminal.

If you want to copy an macOS operating system environment from one Mac to another Macs, you can create a bootable clone backup for the source Mac. Then on other Macs, enter into macOS Recovery mode, use Disk Utility Restore From feature to restore the source macOS to all the target Macs.