JkDefrag is a free defragmentation program for all Windows systems starting from Windows 2000*1.

JkDefragGUI is the graphical user interface for comfortable handling for this program.

JkDefrag (GNU licence*2) defragments very fast, has several optimisation strategies, offers highest possible data security and can also defragment external storage media. However options can only be entered over the Windows command.

With JkDefragGUI (Freeware) the operation becomes very easy. Beyond that it has some additional functions e.g. planning the defragmentation, storing the personal settings, configuring the screensaver...