I have two partitions that are bootable on the internal drive of my Mac running macOS Catalina 10.15.7. Both are encrypted APFS volumes.
Whenever I log in to one of them, I am getting a promt, asking me for the password of the other. I do not want to store the password in the keychain to work around the prompt (for security reasons), in fact I do not want the other volume to be automatically mounted at all. All I want is to be able to choose the boot volume on startup (via the [Opt] key).
- adding this line to my
UUID=<UUID of the volume> none apfs rw,noauto
but this does not prevent the prompt from appearing.
- changing the volume role via
diskutil ap changeVolumeRole <diskId> D
but this returns the error:
Error setting APFS Volume role: Unable to set the APFS Volume Role (-69599)
Is there seriously no way of preventing disks from being automounted? Can the Finder be at leat taught to not ask for the password?