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. IObit SmartDefrag is 100% free for personal, home and small business. Detected by many strictest tests, IObit SmartDefrag is 100% safe and has no spyware/adware.Features: Extremely Easy to UseIts intuitive interface makes Smart Defrag the ideal utility for complete computer novice.Exceptionally Efficient DefragmentationSmart Defrag has the world’s fastest defragmenting engine. It’s been specially designed for modern, large hard drives, so it eliminates long waiting time. Optimize Disk PerformanceSmart Defrag doesn’t just use simple defragmentation. It also streamlines your file system, places the frequently used files and directories into the fastest area of the disk, enabling your computer to run at top speed with the most stability. Always-on to Work AutomaticallySmart Defrag works automatically and quietly in the background, so it continually and constantly keeps your computer fragment-free. Data Safe and Reliability GuaranteedBesides, unlike other "Automated" Defragmenters, Smart Defrag does NOT constantly perform analysis and defrag, which does damage your hard drive and shorten its life. Smart Defrag has a "Safe Intelligence" technology that can assure the health of your disk by deciding When and How to execute defragmentation. Free Defragmenter ForeverSmart Defrag is 100% freeware. Download, use, and update it absolutely free for your personal computers, business or enterprise servers –– it won’t cost you a penny.