How can I drive it?

Users questions: First talk about my D drive it. All the folders only add up to 12G, why have I have been using the 15G show it?? System disk C drive that is the case, no reason to be in vain several G accounts for the space .. . Will they master the one thing this is how ah??
Experts answer: hidden files and folders , The Recycle Bin in the trash, the system restore data, virtual memory, they should take up space, so you investigate all folders are displayed and from the disk with the survey will be used does not match. In the Folder Options settings show all files, display protected by the system files and folders, empty the Recycle Bin, clear System Restore Data or turn off System Restore, the virtual memory value to the minimum, so you will reduce the gap, but not completely consistent.
  • This information provided by the users.Thanks!