JkDefrag is a free, very small disk defragmentation application for Windows 2000 and above. It does not require the user to have any knowledge of how to optimize files on the disk, just run the JkDefrag.exe file, and the entire defragmentation process takes place automatically. Another advantage of the tool is the use of few system resources and the ability to operate from the command line.

Additionally, the archive contains instructions on how to use the program as a screen saver.