de·frag·ment 
(dĭ-frăgmənt)
(dĭ-frăgmənt)tr.v. de·frag·ment·ed, de·frag·ment·ing, de·frag·ments
Computers
Computers
To reorganize (a storage device) to eliminate or reduce fragmentation.
de·frag′men·tation (-mən-tāshən, -mĕn-) n.
de·fragment·er n.