Quote:
Originally Posted by odamizu
In that case, my original understanding was incorrect.
Looking at my Mac's directory, I have: - Applications
- Library
- System
- Users
1) If I have High Sierra installed on my Mac and I install Mojave on an external drive, what exactly would be installed on the external drive? Just the System folder? Then the external drive would share the Applications, Library, and Users folders with my Mac? Wouldn't there be a risk of adverse effects and incompatibilities between the two systems?
2) If Apple releases a software update for Mojave, which is on the external drive, how would that work? Would I be alerted the next time I booted from the Mojave drive and the update would be applied to Mojave without affecting the High Sierra system on my Mac?
I am risk-averse and don't want to do anything that might mess up my primary Mac.
Thank you |
Sorry, by user account I was thinking of Apple ID, which you can share on multiple machines anyway. For the local machine's user account, I would pick the same (primary) user name and password to avoid confusion.
Each installed macOS is a self-contained system, with all the four directories you listed above and other hidden directories such as bin, dev, etc. But you can still access Applications on another hard drive.
As long as you install another macOS only on an external hard disk, there is no real risk of messing up your primary OS on the internal hard disk.