We’ll explain how to get those files on your Mac in a sec.ĭo you have your external drive ready? Great! Let’s grab the installer files now. The drive should be formatted as Mac OS Extended. An external drive (USB flash drive or any other type) with at least 14GB of free space.What you need to create a bootable USB for Macīefore we begin, here are two main things you need to create a bootable USB: Whether it’s an external hard drive or a USB ‘thumb’ drive, both are considered bootable drives.įor the sake of clarity, we’ll simply refer to any external drive as a USB drive. Simply stated, a bootable USB Mac drive is one that has a version (or versions) of macOS available on a disk that isn’t your machine. Try free What is a bootable USB or external drive?
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