To do so, all you really have to do is relocate your user data folders to the D: drive. First, make a folder on the D: drive called something like data then open file explorer to your user profile folder by navigating to C:\users\. Then drag and drop the data folders (documents, pictures, movies, music, downloads, etc.) to the folder you put on the D: drive. Windows will ask if you want to move your data to the new location and you can answer positively.