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(computer science)
A program that analyzes storage locations of files on a computer disk and then carries out defragmentation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


To reorganize the disk by putting files into contiguous order. Because the operating system stores new data in whatever free space is available, data files become spread out across the disk as they are updated. Large files may be broken into thousands of fragments, causing the read/write head to move back and forth numerous extra times to read the data. A "defragger" or "optimizer program" rewrites all the files and stores them in adjacent sectors.

Windows comes with the DEFRAG.EXE utility, which can be activated by the Run dialog from the Start menu. Other popular defraggers, such as Diskeeper, offer enhanced capabilities.

Users Run the Gamut
Some users are fanatical about defragging their disks on a regular basis. Others rarely do it, if ever. After defragmenting, performance increases are most noticeable on very large databases that had been heavily fragmented. Because today's computers are so fast, users may not notice any increase in speed with routine applications such as word processing and spreadsheets, especially if the files are small.

A Good Habit
Nevertheless, defragmenting disks regularly is good practice because it reduces wear and tear on the drive mechanism. In addition, should the hard disk ever crash and you did not back up important files, data recovery experts will tell you that a defragged disk is much easier to restore.

Before and After
Diskeeper is one of the most popular defraggers on the market. The red in the drive map at the top shows all the fragmented files. After defragmenting, the new drive map was pasted on the bottom for comparison. Diskeeper can be set up to defrag the disk whenever the machine is idle. As soon as the user clicks the mouse or presses a key, the defragging is suspended.
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Even though the defragmenter can be used on traditional keyboard and mouse PCs, Disk Defrag Touch is fully touch-enabled and SSD-compatible, which makes it a disk maintenance tool of choice for users of Windows 8 and Windows 8.1 touch-screen computers and tablets.
Complete the disk cleanup and defragmenter procedures once a month using the Accessories Tool.
The company is a provider of system performance/defragmentation software for Windows NT 2000, XP and OpenVMS operating systems, producing more than 95 per cent of the network defragmenters used in the corporate market.
ScanDisk stabilizes your computer while a Disk Defragmenter speeds up your computer by refiling your files.
Disk Defragmenter patiently analyses the content of the hard disk and rearranges the filing structure into sequence so that access rates are improved.
When I check my own disk drives every couple of months I get rid of unnecessary files, I run optimization utilities, like a defragmenter, and generally open up more capacity, There are plenty of equivalent tools for managing big RAIDS.
It lets you schedule automatic runs of Disk Defragmenter, CleanUp and ScanDisk.
Diskeeper is a network defragmenter that works quickly and efficiently.
Improved ScanDisk and Disk Defragmenter. Microsoft claims that both of these utilities have been improved to support new, larger hard drives.
4) Run "scan disk," and "disk defragmenter" to clean up your hard drive.