Main Page | See live article | Alphabetical index A disk defragmenter is a program designed to increase access speed (and sometimes increase the amount of useable space) by rearranging files stored on a disk to occupy contiguous storage locations. Disk defragmenters are available for many platforms, the most common being those included with operating systems (i.e. Microsoft Windows), utility packages (like Norton Utilities), or other standalone defragmenters (like Diskkeeper). Many offer advanced options, such as sorting by last access or modification date to decrease access time for most commonly accessed files. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.