yes they are physical internal sata iii drives. No, my boot ssd is a 120gb Intel. The board is intel based s1150, Rst drivers are not installed.
What I actually did, is to move all data to other disks outside of the pool, do a clean install from win 8.1 to 10 pro, released my DB licence, installed the stable version of DB,
pool is up and running normally, moved over the data, seems ok. No issues at all, I still can't explain it though, perhaps it was an operating system corruption that caused the issue, I really don't know.
Anyway, thanks once again for the assistance.