First off, I have seen recomendations that SSD's should not be defragged.

Why?

I have not seen an explination as to why it is wrong to do it.

As to how WIN 10 figures in this:

I have had a lot of problems with my WIN 10 Trainz machine lately and it made me dig through settings and I found somethng that seemed to be a default setting to continously defrag all hard drives and I had three SSD's and one mechanical drive so I immediately turned off that setting.

I guess I'm stupid but I've had WIN 10 for a while now and I just wanted to get Trainz up and running and I never went through the intro to new features that WIN 10 presents the first time it starts.

Wild Willy the Wacko