Defrag
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Windows_XP-Disk_Defragmenter.png
Windows_XP-Disk_Defragmenter.png
DEFRAG or Disk Defragmenter is a program included with most versions of the MS-DOS and Microsoft Windows operating systems which defragments a file system such as a hard drive.
See Defragmentation for information about this process.
Most notably, Windows NT 4 did not come with any defragmentation utility.