Without using the disk manager to create a partition, create a D: and E: Drive that will easily map to a folder on the C: Drive.
If you have a CD/DVD Drive, move it to F:
In the Computer Manager under Disk Management, right click on the CD/DVD Drive and assigne the drive leter F.
Create the D: and E: Drive
First of, crate the two folders on the C: Disk.
Now, type the following commands in the console:
subst D: C:\Drive_D subst E: C:\Drive_E
The drives are now visible in the File Explorer under This PC.
To make this mapping permanent (work after system restart), add string values to the Registry Manager under
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices with: