How to

How to run Mojave and Catalina on the same Mac

You can run Mojave and Catalina on the same Mac in a dual boot setup and without reformatting or repartitioning your Mac's storage thanks to APFS, the file formatting system that Apple made ubiquitous with Mojave's release. Great if you need to use apps that won't run on Catalina, but still want to use what Catalina has to offer. Here's how.