Thread: running Catalina and High Sierra on same Mac
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Old 07-28-2019, 07:25 AM   #29
asleyam
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Quote:
Originally Posted by odamizu View Post

For now I want to create a bootable external drive running a different macOS (e.g., Catalina beta) than my primary Mac so that I can experiment and test without compromising my primary Mac. Everyone on this thread has been helpful teaching me this. Thank you to all!!
I installed Catalina beta in a spare external drive using a usb Catalina installer. Once booted into catalina, disk utility shows 2 containers and when mounted in mohave the external drive (which I named Catalina) appears as 2 volumes. One is Catalina, the other is Catalina - Data.
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