In this post we will be creating the dual boot Mac OS X system using the first option. The first is to create a separate partition on your existing internal hard drive and install latest Mac OS X version on it while the second is to install latest version on an external hard drive and use it to boot your Mac by holding the option key during boot up and the option third is to install the latest version in a virtualization software like Parallels, VMware or Oracle’s free VirtualBox. Let me tell you, there are at least three ways of running two different version of Mac OS X alongside on the same Mac.
Though, you can use this guide to install and run any two different versions of Mac OS X System like macOS Sierra alongside Mavericks, Yosemite, El Capitan or macOS High Sierra provided your Mac is compatible with the latest version. Those two different version of OS X would be Mac OS X 10.10 Yosemite and macOS Sierra 10.12. Here in this article, we will be focusing on creating dual boot Mac by installing two different versions of OS X on two separate partition of the same hard drive. By saying dual boot Mac, means running two different version of OS (Operating System) which could be either two different Mac OS X versions or one Mac OS X and other as windows or Linux. You can easily do this by creating a dual boot Mac OS X system which will not harm your previous Mac OS X and also install the latest macOS version alongside. But, at the same time we also do not want to miss out on the new features or great performance added to the latest version of macOS, so many of us prefer to try things out first and upgrade a little later. Apple runs under the philosophy that everyone should use the latest and greatest OS but newly introduced versions are never free from bugs and problems so most of us fear from upgrading due to its post consequences like system failure, incompatibility or instability.
Over the last few years, Apple has been introducing new versions of operating system every year which add new features and improve the performance in the previous version.