I agree with this post. But here is my layout.
Use Win 10 Disk Management to create 3 disks on the 1TB SSD.
c: = 100 GB
d: = 400 GB
e: = rest oft the 1 TB
Install Win 10 only on the C: drive as a clean install.
Via: Create installation media for Windows
Install FS2020 on the D: drive and other related file.
Install other programs on the E: drive.
My disk Management:
I have MS 10 on C:. I can reinstall it if needed.
Or restore a backup of it.
I have FS 2020 on D:. And related FS2020 files.
I have other programs on F:.
G: unused.
Other misc files on H:.
Note:
C: and D: are on a Samsung 970 EVO Plus 500 GB NVMe M.2 SSD.
F:, G:, and H: are on a 1TB Intel 665p NVMe M.2 SSD.
I have all 5 drives backed up and can restore each individually.