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很简约:没有皮肤,没有本地化设置,没有动画. 它很小却很强大! 它可以运行在Windows 2000，Windows XP 以及Windows Server 2003之上.目前还不支持 NT 4.0.Features and restrictions:

* optimal algorithm
* support basic include/exclude filters
* exclude zero-length files and files that are placed in MFT
* full support of compressed files processing
* Compact command optimize free space disposition
* generate useful html report
* Not support volumes with more than 4.294.967.295 clusters
* not work on NT 4.0
*  very fast defragmentation, because engine is kernel mode driver and has optimal algorithm.
*  very small engine written in pure C language.
*  nice graphical interface - compact and comfortable.

下载: http://nchc.dl.sourceforge.net/sourceforge/ultradefrag/ultradefrag-1.0.1.bin.i386.exe
官方主页：http://sourceforge.net/projects/ultradefrag/