Written by
Connie YangSummary: Learn how to create USB bootable macOS High Sierra on Mac and Windows step by step, including downloading the macOS High Sierra full installer, connecting the USB drive, and creating a bootable macOS High Sierra USB drive.
Creating a USB bootable macOS High Sierra helps you run this old version on an unsupported Mac or even a Windows PC. Whether you want to create a bootable USB of High Sierra on macOS Monterey, Sequoia, Sonoma, Ventura, Big Sur, Catalina, or Mojave, just follow our stepwise guide.
How to create a USB bootable macOS High Sierra? Here are the quick steps:
Making a bootable USB macOS High Sierra on Mac:
- Download the macOS High Sierra full installer on your Mac.
- Erase the USB drive to Mac OS Extended (Journaled).
- Run the specific command in Terminal to create a bootable macOS High Sierra USB drive.
Creating High Sierra bootable USB from Windows:
- Download macOS High Sierra and TransMac on a Windows computer.
- Connect a clean USB drive with a GPT scheme to the PC.
- Extract the BaseSystem.dmg file using TransMac.
- Format the USB and restore the macOS High Sierra DMG to it.
Go to tell more people the quick steps to create a macOS High Sierra bootable installer.
If you want more details, please move on!
Step 1: Complete the necessary Preparations
To ensure the success of the bootable USB creation, you need to make these preparations.
1. A clean 64 GB USB flash drive formatted with Mac OS Extended (Journaled) or APFS
Although the Apple support team thinks that using a 32 GB USB flash drive is enough, the larger capacity of the USB can lower the possibility of booting failure and sluggish performance.
That's because the system runs on the USB and cache files will be produced. So, you'd better prepare a 64 GB USB.
Moreover, the USB drive should be reformatted to Mac OS Extended (Journaled), GUID Partition Map in Disk Utility. If you are preparing to use the High Sierra bootable drive on Apple silicon Macs, you should choose APFS.
2. Release more space on your Mac or Windows
macOS High Sierra full installer is about 4.9 GB, and the bootable USB creation process will also exhaust disk space and resources. If you don't want to face macOS High Sierra downloading failure and sluggish creation process due to insufficient space, free up more space on your Mac or PC.
It is indeed hard to clean up a computer scattered with files and apps. Alternatively, you can use a professional cleaner like iBoysoft DiskGeeker to clear system junk files with simple clicks.
On a Mac:
- Download, install, and open iBoysoft DiskGeeker for Mac on Mac.
- Select Macintosh HD - Data or macOS - Data (the user data volume) and click Clean Junk.
- After scanning, select the junk files you want to delete and click Clean.
On a Windows:
- Download, install, and open iBoysoft DiskGeeker for Windows on Windows.
- Wait for the scanning process to finish.
- Select the junk files you want to remove and click Clean.
Share this easy-to-use Mac or Windows cleaner with your friends.
Step 2: Download the macOS High Sierra full installer
Before starting to download the installer, ensure your network connection is well. We have experienced downloading failure caused by the unstable Wi-Fi.
Whether you need to download macOS High Sierra on a Windows PC or a Mac, click the link below to get the DMG file.
macOS High Sierra DMG download (from archive.org, macOS 10.13.6, 4.9 GB, free)
Note: After downloading macOS High Sierra on a Mac, we found it would automatically switch to the installation course. Don't click Continue, or else High Sierra will install on this Mac machine. Go to click Install macOS High Sierra on the Apple menu bar > Quit Install macOS to stop the installation.
Step 3: Create a bootable High Sierra USB
After preparing the USB drive, enough free space on the computer, and the macOS High Sierra full installer, now we can get down to creating a bootable High Sierra USB.
Create USB bootable macOS High Sierra on Mac
Follow the steps below to create a bootable High Sierra installer on Ventura, create a bootable USB of High Sierra on macOS Monterey, create a bootable High Sierra USB from Mojave, etc.
- Connect the USB drive to your Mac.
- Open Terminal.
- Enter the command below to create a bootable macOS High Sierra USB installer. Replace MyVolume with the name of your USB drive. sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
- Enter your admin password and press Enter to allow the operation.
- Wait for the creation process to complete.
- Quit Terminal.
Now, the macOS High Sierra bootable USB is created. You can use it to boot your unbootable or unsupported Mac.
Reference: How to boot your Mac from a USB?
Create a High Sierra bootable USB from Windows
To create a macOS High Sierra bootable USB from Windows, you should utilize TransMac. TransMac allows us to write and transfer files to and from macOS-compatible drives(APFS, HFS+, and HFS file systems) and is commonly used to create macOS bootable USB drives from a Windows device.
So, please download TransMac and install it on your PC first. Then, follow these steps:
- Right-click on the TransMac application and choose Run as administrator > Yes to allow this tool to make changes on this computer.
- Wait for a moment and click Run.
- Click the File button > Open Disk Image.
- Select the macOS High Sierra .dmg file and click Open.
- Click InstallOS.dmg on the sidebar > the Install macOS folder.
- Drag and drop the InstallOS.pkg file to your desktop.
- Click the File button again > Open Disk Image.
- Select the InstallOS.pkg file that you've just dropped to your desktop and click Open.
- Click the Tools button > Settings.
- Select Show hidden and system files (use with caution) and click OK.
- Click the InstallOS.pkg file.
- Click OS X Install ESD from the sidebar.
- Find and select BaseSystem.dmg and drag and drop it to the desktop.
- Keep TransMac opening.
- Connect the USB drive to your Windows computer.
- Right-click the USB and choose Format Disk for Mac > Yes.
- Name the USB and wait for the drive to be formatted.
- Right-click the USB and choose Restore with Disk Image.
- Choose BaseSystem.dmg and click Open.
- Click OK > Yes to start the restore process.
After that, you get a macOS High Sierra bootable USB on Windows. If you want to get more details, follow: How to create a macOS bootable USB from Windows 10/11?
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