Ultimate Defrag 5

Ultimate Defrag is a "free Defragmenter that allows you to optimize your hard drive any way you want". UltimateDefrag enables a user to not only defrag files on a disk, but also put frequently accessed files in areas on your hard drive where they will achieve maximum performance. UltimateDefrag places your rarely used files out of the way and onto the slower performing areas of your hard drive making your drive perform much better. It can relocate files based on five different factors.

How to make it portable:
* Download and run the Ultimate Defrag Setup exe (installing to the default path)
* Copy the UltimateDefrag folder from C:\Program Files\DiskTrix to your USB device
* Launch UDefrag.exe from the UltimateDefrag folder to run the program

Note that this is probably the last freeware version. So grab your copu, while it is still available.