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indeed, when I do so on another partition of my HD, it is considered as a new Mac, but I would like to use this second system transparently : 2 systems looking to the same Mac !! MacBook Pro 2021, macOS Monterey, I would like to test Sonoma without hassle. Thank you for your help.
MacBook Pro 13″, macOS 10.14
There are basically two methods
On way is On the existing Internal Drive for more realistic Performance testing
The second way is on a External SSD Drive at lower performance testing
#1 Use more than one version of macOS on a Mac - Apple Support
# 2 Use an external SSD as your startup disk with your iMac or Mac mini
There are basically two methods
On way is On the existing Internal Drive for more realistic Performance testing
The second way is on a External SSD Drive at lower performance testing
#1 Use more than one version of macOS on a Mac - Apple Support
# 2 Use an external SSD as your startup disk with your iMac or Mac mini
When a Long Time Contributor like @BDAqua joints this question of yours.
I usually sit up and pay close attention to the advise .
I too would probable use the external SSD Drive is Testing Sonoma.
Just so you understand where I am coming from.
Have upgraded 2 M1 Computers from macOS 11 Big Sur to macOS 12 Monterey to macOS 13 Ventura and now on macOS 14 Sonoma 14.0
I keep my machines ultra clean of Third Party Software and all upGrades have gone without issue apart from learning the Change from System Preferences to System Setting in macOS 13 Ventura and above
Some Users have had success Cloning to a External Drive and then upGrading the External to Sonoma
Other have not
Personal opinion not solicited - Install the Sonoma Directly to the External Drive to avoid any disappoints or added complications
Worst Case if it fails - Erase the External Drive and use the earlier suggestion above
The Apple Apps aren't likely to work in more than one version, I'd go with installing on an external drive. preferably an SSD.
I did exactly that on a clone of my Venture system to an external SSD. I used SuperDuper! to make the bootable Ventura clone, booted from that clone, then upgraded it to Sonoma.
Mayne thanks for your answer !
To all the kind helpers : Thank you a lot, I will try again !
Keep us in the plural updated on your progress
How to install a second startup system without copying the entire disk (especially the applications ?)
