IObit Smart Defrag 5 is a Free Disk Defragmenter, that accelerates the whole system with fast and efficient disk defragment. Based on IObit latest disk defrag engine and “Boot Time Disk Defrag” technology, Smart Defrag 5 is created with the world’s leading defragmentation ability. It not only provides defragmentation, but also intelligently streamlines your files based on using frequency, thus accelerating disk speed and the whole system for top performance! Smart Defrag 5 works fast, automatically and quietly in the background and is suitable for large hard drives. IObit Smart Defrag helps defragment your hard drive more efficiently than any other product on the market – free or not. It is known that disk fragments has been a primary cause of slow and unstable PC performance.