"Did you make any changes or run any tools recently that would have caused them to appear?"
Not a thing that I can think of, no. There has been no need to run tools, because there hasn't been anything be concerned about. I'm diligent about keeping Malwarebytes and Avast updated, though they mostly update themselves because I have the paid versions of both.
I can't think of any changes because I don't make system changes very often at all. I would need specific reason for that. My computer is an investment (couldn't work without it), but though I'd like to be more geeky I don't pretend that I have any business fooling around with most things. Ha!
Two things though, which could, maybe be triggers with a delayed effect? ?
Recently, the computer, typically in use all day, every day - was not started a single time for a little over a week. I had TURP surgery, which was followed with serious complications. When able to fire the computer up again, Avast about had a heart attack when it realized it was not up to date. Funny at the time, and no noticeable issues followed. Still . . . ?
Second, there was a power outage here several nights ago. I run most everything I can througn an APC BR1500G BACK-UPS RS 1500, which is connected to an APC BR24BPG Back-UPS Pro External Battery Pack. Despite plenty of capacity, it is my personal policy to shut down all programs and then the computer itself during an outage of more than a minute.
(Electrical 'blips' are not uncommon in this area, so the power can be out for just a second or so - one reason that I am strongly invested in power backup. I've lived here for eleven years without incident. I would hope that my extra caution with keeping an even and uninterrupted power supply has helped me without my ever knowing. 'Blips' are much less common than they used to be. Haven't had one in several months at least. Actual power outages lasting any time at all are very, very rare.)
HOWEVER, when power was restored and I went to restart the computer - it absolutely did not want to start up.? During the outage I had closed each open program one at a time while under battery power and then shut down - as usual. But after that I would do a startup and during the startup process (sometimes before entering the password, sometimes after), the computer would shut itself down. This happened several times. The first time that I thought I had a good start, having entered the password, and having selected "Desktop" . . . it shut itself down after a couple of minutes - just when I was thinking I had a good start.
The next time that I thought that I had a good start, everything did go perfectly fine and I have been using the computer as usual without a single hitch in any startup. There has been a few days now between the power outage event and these drives that have suddenly shown up on the "Devices and drives" list - with a couple days between the appearance of the first and the appearance of the second - which literally happened immediately after asking the question about the first one. I had that screen open on the right-side monitor and caught a blip of movement out of the corner of my eye. I looked over and there was WINRETOOLS.
I don't mind their being on the list if legitmate but generally hidden 'drives'. I'll just leave them alone, but wonder if there is anything to be worried about overall that should be dealt with.? I did run the Dell system-and-hardware testing-and-diagnostic tool, which takes a fair while to run, and it passed all tests.
I have long had 'show all hidden folders and files' checked. It's something I've done with every computer, but this seems to be a different kind of thing from what that does.
SOME available but unused drives are commonly on the list, such as BD-ROM Drive (D:) and CF/MD (F:), and the like. I just ignore them, of course, and they run fine when needed and actually in use.