What is mac os 10.12 bootable usb used for

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You can get the latest version of the High Sierra or Sierra installer from the Mac App store.

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How do I get the High Sierra or Sierra installer? 2 Here’s this year’s version, for both macOS High Sierra (10.13) and macOS Sierra (10.12), of my annual how-to guide. 1 It’s great for installing the OS on multiple Macs, because you don’t have to download the ~5GB installer onto each computer, and it serves as a handy emergency disk if your Mac is experiencing problems. I’ve long recommended creating a bootable installer drive-on an external hard drive, thumb drive, or USB stick-for the version of macOS you’re running on your Mac.

 

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