![]() Connect the USB drive to the Mac, remember this USB flash drive is going to be erased and formatted, so be sure nothing important is on that disk.If you already ran the installer, you’d need to re-download MacOS Sierra and be sure it’s in /Applications/ folder.Ĭreate a MacOS Sierra Bootable Installer Drive Note that you’ll want to run through the bootable installer creation process before installing MacOS Sierra, because the installer application deletes itself once MacOS Sierra has completed installing. The MacOS Sierra installer application, labeled as “Install macOS Sierra.app”, “Install macOS Sierra Public Beta.app” or “Install 10.12 Developer Preview.app”, must reside in the /Applications/ folder, just like it does when you finish downloading it from the Mac App Store. The USB drive can be anything really, but the flash thumb drive is recommended due to ease. MacOS Sierra 10.12 Beta Installer application downloaded from the App Store / Developer Center or downloaded from Public Beta. ![]() ![]() USB flash drive that you don’t mind formatting, this will become the bootable 10.12 Sierra installer drive ( 16GB or larger recommended, these are very cheap on Amazon).Requirements for Making Bootable MacOS 10.12 Install Diskīefore beginning, you will need the following: We’ll walk through exactly how to create a macOS Sierra 10.12 bootable install drive using the current Public Beta or Developer Beta preview release and a USB flash drive.
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