Is there a way to disable the "enter a password to unlock the disk" prompt for a disk?
I found this, which is basically the same as the quora.com method (link above):

http://www.idownloadblog.com/2016/11/24/prevent-partitions-from-mounting-mac/

However, for me, although it DOES prevent the volume from being mounted on startup, so far it DOES NOT prevent the popup "enter a password to unlock the disk".