What is defragmentation?(quick quick)
 Approach and defragmenters by file system type
FAT: MS-DOS 6.x and Windows 9x-systems come with a defragmentation utility called Defrag. The DOS version is a limited version of Norton SpeedDisk. The version that came with Windows 9x was licensed from Symantec Corporation, and the version that came with Windows 2000 and above (with the exceptions of Vista, Server 2008, and 7) is licensed from Diskeeper Corporation.
NTFS: Windows 2000 and newer include a defragmentation tool base ...more