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Quick Answer. Defrag is a shortened form of the word defragment, a process of sequencing fragmented data on a hard drive or storage device. Defragmentation allows computers and other electronic storage devices to work more efficiently in general performance, as well as in the retrieving of requested files and sites.
Defragmenting your disk volume arranges files (and free space) in an orderly manner, reducing the time taken to read a file. There are various tools available to defragment the computer, and one version is included with MS Windows.Here are some methods for defragmenting your Windows computer.hen your computer writes data into a file on your hard drive, it's not always able to place all of the data together. A section of a file might be written near the beginning of the disc, the rest of that file could be written near the end.