Therefore, if you need to restore lost data from the system disk under mac OS 10.13, please "disable System Integrity Protection" first.
I have used GNU ddrescue to copy a crashed WD external disk over to an identical one.
Curious to resize a Mac Volume with Mac Disk Utility?
Updating boot support partitions for the volume as required. continue reading » I booted from the install DVD and repaired my boot partition with Disk Utility.
While Disk Utility didn't notice any problems, at the end of its tests it said it was "updating boot support partitions for the volume as required." That sounded promising, and sure enough the install worked when I tried it again.
Since the newest and latest version of it is extremely feature-laden, it can be used to enlarge/resize a Mac Volume easily without causing loss in data.
Just a reminder, the last Volume on the Drive cannot be enlarged.