After active work on a computer the hard drive needs to be defragmented. Over time, especially after deleting or uninstalling files and programs, the data break into fragments. It may not seem significant but the hard drive get loaded and seriously slows down system work. If this phenomenon is left unattended the probability of hard disc failure gets higher.. For these reasons it's necessary to defragment a disk periodically. Of course it's possible to use standard tools to defragmentat as provided by OS but we recommend Defraggler. This program possesses a big set of functions. For example, it is possible to set defragmentation during computer downtime or defragment only specific files rather than the whole disc. One more useful function of the program is the possibility of defragmenting all system files on computer startup.