Apple has included a terminal command that can create an install disk for you. Assuming that you have the macOS Sierra installer in your Applications folder and you have a Mac OS Extended (Journaled)-formatted USB drive named "Untitled" mounted on the system, you can create a Sierra install drive by typing the following command into the Terminal.
sudo /Applications/Install\ macOS\
Sierra.app/Contents/Resources/createinstallmedia --volume
/Volumes/Untitled --applicationpath /Applications/Install\ macOS\
Sierra.app --nointeraction
The command will erase the disk and copy the install files over. Give it some time, and your volume will soon be loaded up with not just the macOS installer but also an external recovery partition that may come in handy if your hard drive dies and you're away from an Internet connection.
http://arstechnica.com/gadgets/2016/09/how-to-make-your-own-bootable-macos-10-12-sierra-usb-install-drive/
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