Auslogics Disk Defrag is a free tool which can be used to speed up your PC's hard disk drive(s) by rearranging files from a fragmented state to a better organized state where frequently accessed files and closer to each other. It is a free, but ad-supported defragment disk application that's powerful, user friendly, advanced, light on system resources and easy-to-use.
Here are some screenshots to illustrate the features and user interface of this application: