NTFS is the file system used by Windows. It is a powerful and complicated file system. There are few file systems that provide as many features and to fully cover them all would require a book. And in fact there is a book detailing NTFS, and it's already out of date. The purpose of this article is not to cover all of the features of NTFS, nor will it exhaustively cover NTFS features in detail. Instead we will cover its basic structure and then describe some of its more advanced features and provide use examples where possible. We will focus more on what it does, rather than how it does it. Trying to walk the line between informative and detailed is difficult and so this article contains a lot of references for people who hunger for more detail.