Editors' Note: This version of UltraDefrag is for 64-bit PCs. There is a separate installer for 32-bit systems: UltraDefrag (32-bit).
UltraDefrag is an open source defragmentation tool. Its engine is very fast, because it is created as kernel-mode driver. They are three interfaces to them graphical, console and native. UltraDefrag reduces the file fragmentation, thus it makes disk operations faster. Also the program can optimize a whole disk placing all the files to the fastest part of the disk - to its beginning.
What's new in this version:
Version 5.1.1 fixes a problem with launching the cluster map legend from the help menu, if the path to the HTML file contained spaces.