Is not hidden

Users questions: My question is: I have been with D disk space is 13.9GB, free space is 4.70GB, but I was only one D 206 bytes of disk folder, how is this going? Those things are not being hidden ah? How retrieve the documents ah?
Experts answer: try to defrag, but look at you So was so much occupied, and most should be the hard disk has bad sectors, of course, virtual memory, and the factory method of calculation will be a little worse.
  • This information provided by the users.Thanks!