UltraDefrag (64-bit)

UltraDefrag (64-bit) 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.