Bushfiva Thanks for that.
Doh! I've just seen that this is what
mixture said in the first place.
It's a lot less complicated than I'd feared, so I should have not shied away from it because of the complexity.
Back to original post:
That looked interesting, but at first glance it seemed to only cover one physical drive. I didn't try multiple loads because I saw, on the same site, "HDDLed indicator". This clearly shows the ability to cover more than one physical drive and many logical drives.
First try it failed. It wanted to be where the default install suggested. (C Program files) Put there, it ran.
Right now, it's sitting neatly away in the top left corner, and indeed is showing activity on the two physical drives. I have to stop playing now, so will look at it later.
Edit to say, I've just discovered that it can be repositioned onto the lower bar one segment at a time. ( I couldn't move them together) Then I found that by simply hovering over the segment, it confirmed the drive and gave the data pertaining to the read/write of the moment.