As for me, I changed the location of MSFS a few times - from my internal SSD (which pretty soon was too small) to an external 2 TB SSD connected via fast (!) USB-C, and then just recently back to a newly bought 4 TB 2nd internal SSD.
Actually, you can have
- MSFS itself on a certain drive of your choice (using the Windows builtin App move feature)
- Your MSFS contents (the “big stuff”, >100 GB) on another drive (by changing the useropt.cfg file)
- Linked folders on another drive/other drives into the “Community” folder (using 3rd party software)
This gives you a lot of flexibility in connection with your HDD space
There are some excellent tutorials out there. Just search for “move MSFS to new drive”.
This is one of them.
I hope, this is helpful for you