Auslogics Disk Defrag - Defragmentation free tool for Windows

Disk Defrag will speed up your computer by optimizing file system. It can defragment files, consolidate free space and move system files to the faster part of the disk. With Disk Defrag you will get the maximum out of your hard drive performance. It is supplied with a powerful engine and smart algorithms which allow Disk Defrag to run much faster than similar tools. And with its comprehensive reports you will always be aware of what have been done. Disk Defrag features fast and safe defragmentation of the disk drives, optimization of clusters structure and file system for even better disk performance.

Download link:  http://download.cnet.com/Auslogics-Disk-Defrag/3000-2094_4-10567503.html

Other free options:

• http://ultradefrag.sourceforge.net/en/index.html 
• http://www.mydefrag.com/ 
• http://www.iobit.com/iobitsmartdefrag.html