![]() For this reason, you need an external HD that is at least the same size as your Mac’s internal memory ![]() External hard drive (optional): You need to back up your data to save your important files before installing the new macOS.Make sure the installer is fully downloaded (about 5 GB) Good internet connection: You need to download the macOS High Sierra installer from the App Store.Blank USB drive: You need a flash drive that has at least 16 GB of available storage space to create a bootable macOS High Sierra installer. ![]() Requirements to create a macOS High Sierra bootable USB driveĬreating a bootable drive with a High Sierra installer is quite simple.
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