The screenshot above is from VL version?
I have a pro version installed on a VM and I cannot find this setting in group policy.
Here is how I have set my system with windows 8.1 right now:
C:(ssd)-->OS, games
D:(HDD partition)-->low end software
E:(HDD partiotion)-->storage
And the is a linux HDD partition.
(HDD is divided in 3 partitions: d-e-linux)
I believe that if it was windows 10 and it upgraded it would f*ck the whole setup.