12-04-2018 11:55 AM
Welcome to the Community Forums.
The new "This PC" previously was My Computer in lower Windows version contains all detected locations of the machine. Click on highlighted term. This includes the C: drive D: drive (maybe the optical drive), E: drive (maybe set for document or Lenovo driver folder copy and your other data) and other drives (like a plugged USB drive) etc.
The C: drive usually set by default containing the Windows system files and other user files (users download folder, documents music, pictures , desktop folder).
I hope this helps answer your query.