How to organize dual boot macOS Sierra and El Capitan
Mac users got the opportunity to install a new operating system macOS Sierra, shown at WWDC in early June. Setting OS to dual boot the two platforms – macOS Sierra main and test OS X Yosemite is the most convenient and safe option to test the product.
The possibility of dual boot means that your Mac can run two OS, and when the computer boots, the user selects one of them. macOS Sierra 10.12 will operate independently from the main system OS X 10.11 El Capitan (or even 10.10, 10.9 or 10.8, if you have an older Mac) with your settings and installed programs.
To arrange access to macOS Sierra for such a scheme is easy. Enough to prepare a special partition on the drive, then install OS. But before the breakdown of the drive into partitions, make sure you have a backup of all your data and your computer supports the new OS version. The list is compatible with macOS Sierra Mac models can be found on this page.
Dual booting macOS Sierra and OS X Yosemite:
Step 1: Download the operating system image macOS Sierra. This can be done by logging on to Apple’s website for developers using the torrent or after registering and waiting for the launch of the public version. The way macOS Sierra beta 1 is about 5,01 GB.
Step 2: Open the Mac app Disk utility from the applications folder –> Utilities.
Step 3: In the left pane, select the hard drive of your Mac and click “partition” on the top bar.
Step 4: Take the new OS for at least 15 GB and name the new partition “macOS Sierra HD”. Click Apply to begin configuring disk partitions.
Step 5: when you are finished, close Disk utility and run the installation file “Install 10.12 Developer Preview”.
Step 6: In the setup menu, select the partition macOS Sierra HD as the primary disk (use the command “Show all drives” to see the partition).
The computer will install the operating system macOS Sierra on the second disk partition, which may take 20 to 30 minutes, and will automatically launch the new operating system.
To after all the experiments again to load the primary OS, restart the Mac, hold Option (Alt) and select the boot menu OS X Yosemite.