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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.
Click on Defragment Disk or Defragment Now to begin the defrag process. Your computer will take between several minutes and several hours to defrag the drive depending on its size and current fragmented status.