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Booting Mac OS Mojave in a VMware (Virtual Machine) Now run VirtualBox again and start the virtual machine you created earlier. If you don't have an idea how to clean up your Mac. Otherwise, you will need to remove some content from your Mac to clean up the storage space. Check the available storage space on your Mac to ensure at least 30 GB available storage. 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. 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.
How Much Hd Space Necessary For Mac To Run Mojave Free.