

More folders in the root of C which also become visible after unhiding are $Recycle.bin or Recycler and System Volume Information.

You have to enable the show hidden files and protected operating system files settings in Control Panel Folder Options for these and other files to become viewable. A couple of examples of this are Hiberfil.sys and Pagefile.sys that reside in the root of your C drive. As you might expect, there are many files and folders hidden away in Windows that deal with important tasks such as keeping the system running or allowing certain features to function.
