Thank you for the reply, and for highlighting the points that need clarification.
All of the drives have been updated with the latest firmware. The newest Ultra is just out of the box, off the store shelf, and has the latest processor. The Ultras ae upgraded to O/S 5, and have automimic upgrades as a default. When the older Ultra upgraded to O/S 5, I noticed the change, it showed up differently in Explorer, and I could no longer get to it through Quick View reliably and consistently. It sometimes showed up in Quick View as offline, sometimes I could get to the ‘open drive’ menu selection.to get explorer to view the files, sometimes it would show the temperature of the drives, sometimes just one. Sometimes I could get to the ‘open drive’ menu selection for both drives (the Ultra and the single drive), sometimes only one or the other. The single-drive MyCloud is so old, it can not be upgraded to O/S 5, so it still uses the older O/S. There is not much difference in response between the old single MyCloud and the newest Ultra, as far as Windows 10 seems to be concerned. I do not have any other operating system.
All of the drives use a dynamic IP address, but the address has not changed for the older two drives in months, if not years. I did change the router two years ago, so the IP address certainly changed then.
All of the drives are using the same workgroup. As I stated, when I bring up the dashboard for the two Ultras, side by side, in two tabs of the browser, and go through every page, every entry, they are identical in every respect, every button the same position, every detail the same, except for the drive name and the network addressing (MAC, IP address, serial number, and such).
All of the drives are connected to ports on the same router, along with one desktop. The router then connects to the modem router which connects to the Internet, That is a separate wireless network not bridged to the network of the home router, the modem is essentially a pass-through to the Internet. All of the wireless printers re on the home network. That way, when we change Internet Providers, or the Internet Provider modem, we do not have to set up the network all over again.
Each MyCloud has a unique name. Though, really, I have no idea if at a very deep level Windows remembers the original default name of the drives in some deep recess of its memory, and uses that name at a very deep level. Though that would not explain why a brand new computer, that had never been on the network with the default names, would behave the same way. That would have to be the drive itself, at some deep level, sharing the original default name.
I have toggled the SMP settings, and the NTLv1 settings in every combination, on one drive and not the other, and also all drives equally, and it made no difference. Although I did often just put the computer through a soft restart and not a hard shut down.
There are different antivirus software on almost every computer, from Norton to McAfee to BitDefender to Malawarebites. and all still act the same.
All of the computers are using a private network. In the same Windows computer (with obviously the same SMB settings), one Ultra shows up and the other does not. Does Windows use one SMB setting for one Ultra and not the other, on the same computer?
I suspect your last point is valid - the old Ultra, since it has always been around, is being the bully and is somehow over-riding the lesser single cloud and the newest upstart Ultra, even though the newest Ultra has more memory and a faster processor. Seniority perhaps has its privileges. That theory is supported when, at start-up, the three drives seem to compete in Network as ‘other devices’, each flashing in and out but never disappearing/reappearing in sync, each appear/disappear randomly with no discernable pattern, as if they were battling for supremacy, until they all disappear in ‘other devices’ and the Ultra shows up as a computer. Do I dare taking it offline and try it with just the new Ultra? I am not that desperate, I do not want to lose all of the existing drive mappings. This would seem to be a software issue between WD and Windows, to straighten out in an upgrade.- multiple MyClouds behaving nicely on the same network.
Perhaps I should mention that I also have a ‘slave’ USB drive attached to the older Ultra, and with the newest upgrade O/S, it shows up consistently in the root of the Ultra in QuickAccess and in the Computer icon in Network.
Still can’t map a drive to the root.