How to select your startup disk and start from it in macOS Sierra

How to select your startup disk and start from it in macOS Sierra

If you install macOS Sierra on an external hard drive, thumb drive, or other storage device, your Mac can start up from that device instead of your built-in startup disk. fter installing the operating system on a properly formatted storage device, choose one of the following methods to use that device as the startup disk for your Mac. 

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