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When Microsoft finally shipped its long-awaited new Windows NT operating system, they surprised a few people by naming it not Windows NT 5.0, as had been expected, but Windows 2000. However, the version of NTFS that shipped with Windows 2000 provided a hint at the original name of the operating system: NTFS 5.0. The fact that Microsoft created a new version of the file system to go along with its new operating system demonstrates just how important the NTFS file system is to Windows NT and Windows 2000. Several of the new features in Windows 2000 actually depend on features built into NTFS 5.0, such as the Active Directory service.
The following are the most important of the new features and capabilities that were added to NTFS with version 5.0. Each has been linked to the page where you can read about it in more detail:
Of course, this list isn't comprehensive; there were also some other, minor improvements made in a variety of areas within the file system. This includes fixing some bugs that existed in the older version of the file system, though the new features undoubtedly mean that new ones were included as well. :^) Even the items above represent a rather substantial set of enhancements to what was already a very powerful file system. Of course, NTFS 5.0 also supports all of the features included in older versions of the file system.
As I mentioned above, NTFS 5.0 is required by Windows 2000. In fact, if you install Windows 2000 on top of Windows NT, Windows 2000 will convert any older NTFS partitions to NTFS 5.0. For more on compatibility issues between NTFS 5.0 and older versions of the file system, see the next page.