Disk Defrag is the best free disk defragmenter software that will speed up your hard drive and computer’s overall performance by optimizing file system.

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.

PerfectDisk reduces total IOPs by 15-40% and reduces disk latency up to 80%. The source of these problems is the fragmentation behavior of the virtualized Windows guests. VMware recommends

UltraDefrag is a powerful disk defragmenter for Windows. It can quickly boost performance of your computer and is easy to use. Also it can automatically defragment your disks so you won't need