What are some alternatives?
When comparing IObit Smart Defrag and Windows Disk Defragmenter, you can also consider the following products
Defraggler - Defraggler, the award-winning hard drive defrag tool from the makers of CCleaner. Optimize your hard drive and free up space. Download the latest version for free.
UltraDefrag - UltraDefrag is an open source disk defragmenter for Windows.
PerfectDisk - PerfectDisk reduces total IOPs by 15-40% and reduces disk latency up to 80%.
MyDefrag - MyDefrag (previously JkDefrag) is a disk defragmenter and optimizer (a maintenance utility to make...
WinContig - Freeware file defragmentation tool.
Auslogics Disk Defrag Touch - The smart way to defragment a touch-screen computer running Windows.