Remove Mac OS X from disk without erasing it I have many hard drives on my Mac. Several of them have one version or another of macOS. Most importantly:
Disk A: Sierra. I boot from this disk
Disk B: /Users directory and High Sierra. I do not boot from this disk.
I want to remove High Sierra from Disk B without touching my Users directory, any user data, or erasing the disk.
How should I proceed?
The simplest and safest method would be to make sure your backup is up-to-date, erase the disk and restore that part which you want to keep.
Other methods run the risk of deleting something you want to keep or keeping something that you want to delete.