Hardly think I could do better than you here, Stan
A couple of observations, though, for the benefit of the OP (Original Poster,
@Gomad ) and for The Viewers whom may not know.
1. Screenshots are legend for helping purposes, goodonyer, keep 'em up
2, To save you paging back, a couple of points on two of them, from #18, I have repeated here, cropped in part to relevant parts:
Screenshot 1: GParted & Disks - Seagate
Note the orange-yellow (let's call it mustard or ochre) icon with the small "i" in the centre. Right-click that and it will tell you information, likely of a fault, you can report its content if you like.
Screenshot 2: Gparted & Disks - this is actually your first screenshot, of the Western Digital.
The 1.36 TiB reported by GParted,
is, in fact, the 1.5TB reported by Disks.
If you Google up "tebibyte terabyte" likely first result is from Wikipedia here
https://en.wikipedia.org/wiki/Tebibyte
It is worth getting to understand the difference. This is a standard that has actually been in place for about 10 years,
cross-platform, but many Windows users are unaware of it, and the computer manufacturers ignore it and round figures off even more.
So there are kibibytes, mebibytes, gibibytes and tebibytes.
The conversion rate from Terabyte to Tebibyte is 1 Terabyte = 0.909495 Tebibytes.
So
Screenshot 3: 1.5 TB = 1.36 TiB
I have to scoot, back later.
But
@Gomad , not being at all condescending nor patronising, you are doing
really well, and I expect you will soon be enjoying your Linux just as we do
Cheers
Chris Turner
wizardfromoz