Disk fragmentation is generally main cause of slow and unstable computer performance. Smart Defrag 2 helps defragment your hard drive most efficiently. Smart Defrag 2 not only defragments computer deeply but optimizes disk performance. With ""Install it and forget it"" feature, Smart Defrag 2 works automatically and quietly in the background on your PC, keeping your hard disk running at its speediest. Slow down, freeze-ups and crashes will be a thing of the past.