Yes, V1, I checked to make sure there was no slash in the name, even deleted it then put it back. No joy.
The DH is a typo for HDD.
Might this be relevant? A week ago, using Carbon Copy Cloner, I copied back a volume to my wife's machine. The next day, I got an alert from Carbon Copy Cloner saying that the volume UUID needs reseting and included the procedures for such (though I have not yet done so). Apparently, I have a duplicate UUID???
Might this be the source of my angst?