Open Disk Utility, the app is found in /Applications/Utilities/.This allows MacOS Sierra to run in a self-contained installation without impacting your primary stable OS X EL Capitan installation, thus allowing the dual boot. You will need to partition the hard drive of the Mac to add a new partition for which to install Mac OS Sierra onto. Failure to adequately backup your Mac and your data may result in permanent data loss, do not skip a backup. You will be partitioning a hard drive and then installing beta system software.
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