From: Winnipeg, MB
Apparently almost ALL new computers sold today have an M2 (solid state disk drive) as a "C" drive to hold the operating system and Windows items that the computer builder and you don't want somebody messing with. My Daughters had both this "C" drive, and a "D" drive which was also a 1TB HDD (7200rpm) where she stored everything and she took that out of her computer and gave me the rest - I simply attached my "old" "C" drive (also a 1TB 7200 HDD) and windows automatically converted it to the "D" drive for me. I'm sorry if I wasn't clear on that. Her "C" drive is where the R lee Ermey is located.
I have to re-license and reinstall jsut about everything including shortcuts and am in day three of that process, but my "new"
hand-me-up computer is all pretty good. I-5 4670 vs. I7 9700 is quite a step up in processor alone :)
When my hard drive crashed, I replaced it with an SSD and it is still the "C" drive. You do not need to have it as the "D" drive.
Many years ago I installed a second hard drive in my Dell computer and it required that I flip a tiny switch on the new drive to designate it as a slave - the original "C" hard drive being the master. I am not sure if newer OS handle this relationship automatically. I think you can switch which drive is the "C" drive during boot up by pressing F2 or whatever it says to enter the BIOS configuration (before Windows starts up). Somewhere in the hardware section it will list what it knows is installed on your computer and I think you can select which HD you want to be the boot drive "C" if it has Windows installed on it.
Anyway, if you are having any issues with your current configuration, there is bound to be a YouTube "how to" video about it. Good luck.
No matter how bad a situation is, you can always make it worse. - Chris Hadfield : An Astronaut's Guide To Life On Earth