http://support.apple.com/kb/HT5856?viewlocale=en_US&locale=en_US
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Download the macOS installer from the Mac App Store and make sure it's in your main Applications folder.
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Connect a properly formatted 8GB (or larger) drive. Rename the drive to
Untitled. (The command in the next step assumes the drive is namedUntitled.) -
Run command in terminal: