Mac users got the opportunity to test the new operating system OS X El Capitan, which was announced at a special conference WWDC. Setting OS to dual-boot between the two platforms – the basic OS X Yosemite and test OS X El Capitan is the most convenient and safe option to try out the OS.
The dual-boot means that you are running two operating systems, and when you start the user selects one of them. OS X 10.11 El Capitan will work independently from the main system OS X 10.10 Yosemite (or even 10.9, 10.8 or 10.7, if you have an older Mac) with your settings and installed programs.
To arrange access to OS X El Capitan under the scheme is simple. It is only necessary to prepare a special partition on the hard disk, and then install the OS. But before you begin to disaggregate the drive into sections, make sure you have a backup copy of the data.
How to dual-boot OS X El Capitan and OS X Yosemite:
Step 1: Download the operating system image OS X El Capitan. This can be done by logging on to Apple’s website for developers via torrent or after registration and wait for the public version. The image developer builds of OS X El Capitan is about 5.6 GB.
Step 2: Open Disk utility from the applications folder –> Utilities.
Step 3: Select your main Mac hard drive from the sidebar, then click the Partition tab.
Step 4: Press the button with the “+” next to the partition Scheme. Take the new OS for at least 15 GB and name the new partition OS X El Capitan. Click Apply.
Step 5: Upon completion of the splitting of the drive, quit Disk utility and run the installation file “Install OS X 10.11 Developer Preview” that you downloaded in step 1.
Step 6: In the installation menu, select the OS X partition El Capitan as the primary disk (use the command “Show all drives” to see the partition).
The computer will complete the installation of OS X El Capitan, which may take about half an hour, and will launch a new operating system. To re-boot your main OS, restart the Mac, hold down Option (Alt) and select in the boot menu OS X Yosemite.