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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.
To optimize files for fast access, a volume can be defragmented. Defragmentation is the process of moving portions of files around on a disk to defragment files, that is, the process of moving file clusters on a disk to make them contiguous.For more information, see the following sections: 1  Defragmenting a file. 2  Minimizing interactions between defragmentation and shadow copies.hen using CreateFile to open a directory during defragmentation of a FAT or FAT32 file system volume, specify the GENERIC_READ access mask value. Do not specify the MAXIMUM_ALLOWED access mask value. Access to the directory is denied if that is done.