In what is possibly good news, after this MBP restart my backup drives are working, and my iPhone happily charging. I pulled out my old H2O (ed 1), and that's mounting just fine.
Plugging the Ed 2 H2O in again, I'm now getting a message that the disk is unreadable by this computer - on both Macs.
("Good news" in that the only hardware item in this whole setup that's currently under warranty is the H2O ed 2!)
Off to do that factory reset, methinks.
Last edited by meeera; 10-10-2017 at 12:18 AM.
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