How to Install MacOS Catalina Beta on APFS Volume to Dual Boot with Mojave

If you want to run MacOS Catalina Beta alongside macOS Mojave or macOS High Sierra, you can do so by adding a new APFS volume to the Mac if that Macs hard drive is formatted as APFS. This effectively creates a dual boot scenario for MacOS Catalina 10.15 and Mojave 10.14.x (or High Sierra), and offers an alternative approach to simply installing MacOS Catalina Beta on a Mac as the primary operating system. There are a few advantages to this approach, notably that you can use a single Mac for running the two operating systems, and you won’t need to designate storage capacity for Catalina as it will share the drive space with the other MacOS release and expand as needed.

















