IObit SmartDefrag helps defrag your hard drive most efficiently. The latest stable version can be found here.It's become almost common knowledge that the included disk defragmenter that comes with Microsoft Windows is not the best and never has been. You have many freeware replacements and SmartDefrag is one of the best. You can simply set it as your Windows defragmenter replacement and forget about it or you can go through the many options including boot time defrag. It's completely free and very easy to use as seen in the video below where we walk you through using it.Smart Defrag 5 is a FREE, light, and stable disk defragment tool designed for maximum hard drive performance. With the new generation of ultra-fast defrag engine, Smart Defrag 5 can not only defragment your HDD but also trim your SSD to accelerate disk read/write speed and enhance disk durability. You can easily defrag large files and consolidate free spaces with the newly added Large File Defrag and Free Space Defrag for more efficient defragmentation. Also, you can enjoy top game experience with Game Optimize in Smart Defrag 5. Being the first Disk Defragmenter that fully supports Windows 8/8.1 Metro Apps, Smart Defrag 5 works fast, automatically and quietly in the background and is a disk defragmenter suitable for large hard drives.