@KukaaKatchou1 If your new computer is using Windows 10, you can move your Documents Folder to the 2nd hard drive.
Sorry for the long post, I was just trying to make it easy to follow along with the steps. I know it's kind of confusing, but this was the best way I could explain how to do this, since it's so complicated. I'll be glad to answer any questions you have the best that I can.
I have never actually did this on my own computer, but from what I have read online, and with my computer also having 2 hard drives, this should let you move your documents folder to your D drive.
I can't know for sure if these exact steps will work for you, since your computer may be different. Mine is a custom gaming computer running Windows 10.
Before begining this process, you need to make sure to disable the Microsoft OneDrive Backup on your new computer. As far as I know, you cannot move your Documents folder if you do not disable OneDrive first.
To see if OneDrive is enabled, go to your Documents Folder on your new computer. If you see a little green checkmark or a cloud icon next to the files and folders inside the Documents Folder, then OneDrive is enabled. If there are no green checkmarks or cloud icons next to the files and folders, then You do not need to disable OneDrive, and can move on to the "How to move your Documents Folder" section of this post.
To Disable OneDrive backup:
Step 1: Open the OneDrive program on your computer
Step 2: Right click on the cloud icon in the bottom right corner of the screen (near the clock)
Step 3: Click the gear icon in the menu that opens, and click "settings"
Step 4: Click "Manage Backup" in the window that opens
Step 5: Turn off backup for "Documents"
Note: If possible, you should keep your files backed up to another hard drive or somewhere safe, since they will not be backed up to OneDrive anymore.
How to Move your Documents Folder:
Step 1: Make a folder on your 2nd hard drive called "Documents"
Step 2: Find your original Documents folder on your C Drive.
Step 3: Right click on the Documents folder on the C Drive and select "Properties"
Step 4: In the Properties Window that opens, click on the "Location" tab
Step 5: Click on the "Move" Button inside the location tab
Step 6: another window will open. In this window, find the new "Documents" folder that you created in step 1 on your D Drive. Select it, and click "Select Folder" in the bottom right of the window.
Windows should move your Documents folder to the D Drive.