I have tested several defragmenters to defrag my PC. Some of them work great and some are not. After tested all of them, I decided to stick to UltimateDefrag from Disktrix. I make this choice after Disktrix update
UltimateDefrag is a defragmenter that you can use to defrag your hard drive any way you want to. You can set which folders or files that you want to put in the optimized area and which files that you want to put as an archives.
UltimateDefrag is the ultimate defragger and File Placement Optimizer. Defragging hard drives helps to restore your hard drive performance. File placement optimizing on the other hand, boosts your theoretical hard drive file access performance by up to 300% of manufacturers quoted averages (typical performance increase you’ll experience is between 25 and 100%) by placing the files you want performance from onto the faster performing (outer tracks) areas of your hard drive.
With UltimateDefrag – you can specify which individual files, programs or games you want the best performance from. The “Archive” function places all of your unused files out of the way and onto the slower performing areas of your hard drive.
This is really first time for me. Few days ago, I asked my readers what 
I’m looking for disk defragmenter (other than Windows built-in) that gives good optimization and works without produce any problems to my PC. Does anyone know any best disk defragmenter software? I know there are plenty defrag tools out there but I want to hear from you guys, based on your experiences.