![]() If you want to use a thumb drive, an 8GB drive works perfectly. The installer software will take up over 5GB. Just about any type of USB external drive will work: thumb drive, hard drive, or SSD. How to create a bootable macOS High Sierra installer drive Put the macOS High Sierra installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac. After downloading your macOS version of choice as detailed above, you can download and install DiskMaker X. If you're not a fan of using Terminal, you can try a third-party app designed specifically for creating a bootable macOS USB drive. If you have more than one Mac you want to upgrade to macOS 10.15 Catalina but dont want to waste so much bandwidth downloading it for each machine, one option is to create a bootable installer on. Creating a Bootable USB Using DiskMaker X. The Startup Manager scans and lists the drives that are connected and bootable. When your Mac restarts, press and hold the Option key till “Startup Manager” opens. Follow the below process to boot your Mac from bootable USB: Insert the bootable USB installer drive and go to “Apple Menu Restart”. Related: How to Create macOS Catalina USB Installer on Windows. ![]() For those who doesn’t know, creating a macOS bootable USB installer on Windows is definitely possible and can be done with really simple steps with software like TransMac. In this case, you’d probably want to create macOS High Sierra Bootable USB Installer on Windows.
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