Disk fragmentation is generally main cause of slow and unstable PC performance. IObit SmartDefrag helps defrag your hard drive most efficiently. With "Install it and forget it" feature, IObit SmartDefrag 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. Features include: Easy 2 Use Install it and forget it. The intuitive interface makes IObit SmartDefrag the ideal utility for complete dummies. Always-on Working IObit SmartDefrag works automatically and quietly in the background, constantly keeps your computer fragment-free. Super Efficient Defragmentation No more long time waiting, IObit SmartDefrag has the fastest defragment engine in the world and finishes the job just in minuts. Optimize File System Not just simple defragment, IObit SmartDefrag also streamlines the file system and makes your computer run at the top speed. Free and Free IObit SmartDefrag is 100% freeware. You can get it and update it without any penny.