How to make two (local) disks in Boot Camp on Mac OS - one from the SSD, the other from the HDD?

Question

macOS

There is a MacBook Pro Mid 2010.
I installed an SSD on it, installed the HDD via Optibay, copied the system, deleted it from the HDD.
Everything is working. Windows 7 remained on the HDD through Boot Camp.
I want to demolish it and reinstall it, but: install the OS on the SSD (allocate a piece of 40 gigs - let's call it the C:\ drive), and also make a separate part of the HDD for the files (let's call it the D:\ drive) The
question is how to implement this ?
I did not find anything on the Internet about this. I don’t want to demolish Windows just like that and I don’t want to experiment (sometimes Windows is used, I want to do it at once, so as not to play).
I would be grateful for any advice other than refusing to use any of the specified OS :)

Answer 1

Isn't it easier to use Parralels? Unless, of course, you need to play toys ...
Put the system on a new one on the SSD. Format the HDD to NTFS format. Windows will see everything. On the poppy, you will need to install the ntfs driver of the paragon ntfs type. Either format it into a MAC OS disk, and install the driver to read etx4 in Windows ...