Disk fragmentation is generally main cause of slow and unstable computer performance. Smart Defrag helps defragment your hard drive most efficiently. Smart Defrag not only defragments computer deeply but optimizes disk performance. With "Install it and forget it" feature, Smart Defrag 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 a smart tool to maintain your system performance, speed and stability for no cost at all. IObit SmartDefrag helps defragment your hard drive more efficiently than any other product on the market.

Smart Defrag 4 is a FREE, light, and stable disk defragment tool designed for maximum hard drive performance. Based on IObit latest disk defrag engine and "Boot Time Disk Defrag" technology, Smart Defrag 4 not only provides defragmentation, like any typical disk defragmenter can do, but also intelligently streamlines your files based on using frequency, thus accelerating disk speed for faster data access! With the unique Deep Analyze technology, it smartly clean junk files before defragmentation to save more disk space for you. Being the first Disk Defragmenter that fully supports Windows all, Smart Defrag  works fast, automatically and quietly in the background and is a disk defragmenter suitable for large hard drives.

OS: Win7+

homepage: https://www.iobit.com/en/iobitsmartdefrag.php

Screen:  https://i.postimg.cc/tTfD8G4g/Screen.png