UltraDefrag是强大的开源磁盘整理工具，适用于NT内核的Windows. 它使用内核模式驱动程序，因此它的引擎是非常快.
UltraDefrag is a powerful Open Source Defragmentation tool for Windows Platform. It is very fast, because the defragmenting is done by kernel-mode driver. There are three interface available : Graphical, Console and Native.
UltraDefrag is powerful Open Source defragmentation tool for Windows NT. It is very fast, because the defragmenting is done by kernel-mode driver. They are three interfaces to them: graphical, console and native. The GUI is very useful, because it represents your filesystem visually as a color coded cluster map. The console is another option for those that prefer the command line. It allows you to run UltraDefrag from the task scheduler and scripts. Finally, the native executable will run at boot time in a manner similar to chkdsk.
The design of UltraDefrag is very simple. There are no skins and other unnecessary stuff. It is a small and powerful program!
It can be used on Windows NT 4.0, Windows 2000, Windows XP, Windows Server 2003, Windows Vista and all of the 64-bit editions of Windows. Also check out VISTA INSTALLATION FAQ to see how to run UltraDefrag on Windows Vista without errors.
官方网站：ultradefrag.sourceforge.net
界面预览：Screenshot
Download：下载页面；
direct link[inNT/2000/XP/Server 2003/Vista/Server 2008 x32]
direct link[inXP x64/Server 2003 x64/Vista x64/Server 2008 x64/(AMD platform，Intel Core2 Duo, Pentium D etc.)]