Defragmentation is the process of locating the noncontiguous fragments of data into which a computer file may be divided as it is stored on a hard disk, and rearranging the fragments and restoring them into fewer fragments or into the whole file. Defragmentation reduces data access time and allows storage to be used more efficiently. “Defrag” is a short form of the verb to defragment and sometimes the name of the utility used for defragementing, which is also called a defragmenter.
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