All versions of Windows 2000 have things in common, including many system utilities such as the Microsoft Management Console (MMC) and standard system management applications such as a disk defragmentation utility. There is lots of support for different languages and for people with disabilities. Windows 2000 supports the Windows NT filesystem NTFS 5, the Encrypted File System (EFS), as well as basic and dynamic disk storage. Dynamic disk storage allows different types of volumes to be used (a volume is an area of storage on a hard disk that has been formatted with its own file system structure). The Windows 2000 Server version has many more features, including the ability to provide Active Directory services (a way of organising resources such as printers, users and group), a distributed file system (a file system that supports sharing of files) and fault-redundant storage volumes.