You mean use terminal for my internal drive? This is what I got:
Last login: Thu Apr 23 11:05:19 on console MacBook-Pro:~ (my name)$ diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *121.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 46.3 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Apple_HFS Catalina 44.1 GB disk0s4 5: Apple_HFS Mojave 29.8 GB disk0s5
Originally Posted By: artie505
I'm going to check out command-option-R just for the heck of seeing what you ran into.
But regardless, before you upgrade I think it will pay you to run a "surface scan" on your external to eliminate a possible root cause of that prohibited sign, which just plain should not be happening. You don't want that drive to be compromised while you're into the upgrade process, because it's your backup.
Please copy & paste "diskutil list" (withOUT the quotes) into /System/Applications/Utilities/Terminal and post your results. (Don't forget to edit out your name if it's there.)
And now for dinner!
MacBook Pro - M2, Ventura 13.6 Safari Tech Prev 17.0 Safari 16.6 Firefox 116.0.2 iPhone 7 Version 15.8
