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Software- macOS Sierra 10.12 installer app.In this tutorial, I'll show you two ways to install macOS Sierra onto a bootable USB drive.

It is better than OS X Recovery as you don’t have to download the ~5GB installer data, first, to reinstall the OS or installer disk for Macs that does not support OS X Recovery. If a Mac is having some issues a bootable USB of the OS can serve as an emergency disk.

Whilst the process of downloading and installing an OS through the Mac App Store is straightforward enough, it’s painful for people with a slower internet connection, or if they’ve multiple Macs in their home. MacOS Sierra 10.12 is the thirteenth major release from Apple, released on 20th September 2016 as a free upgrade via the Mac App Store.