I think due to the new APFS file system.in order to switch from one macOS to the other.a special "Data" folder is created for the newer macOS (Catalina in this case). Had High Sierra in one container.and had Catalina in a 2nd container. Here's my personal story with 2 macOS versions on the same drive (different partitions/containers). High Sierra is the first macOS to use the newer Apple storage format APFS (I think when you do the High Sierra install.you need to select APFS formatting).Īctually with APFS.Apple no longer calls these "Partitions".they're called "Containers".since "Containers" work & act differently than old-school partitions. Click to expand.Normally I'd be the first person to say install the 2nd macOS needed on a different/2nd partition.but from some recent experience I've had doing doesn't work as seamless as it has in the past (at least for me).įirst wanted to mention that installing macOS 10.13 High Sierra requires a firmware update (not really a big deal.but something that's not always needed when doing a macOS upgrade/install).
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