Free (released under the GNU General Public License) disk defragment and optimize utility for Windows 2000/2003/XP/Vista/X64. Completely automatic and very easy to use, fast, low overhead, with two optimization strategies, and can handle floppies and USB disks/sticks. Included are a Windows version, a commandline version (for scheduling by the task scheduler or for use from administrator scripts), a screensaver version, a DLL library (for use from programming languages), and versions for Windows X64.

Changes in this version:

- Changed the message in the docs about the screensaver under Vista, it works if User Account Control is turned off.
- Bugfix in "-a 3" (fast optimize). It would not use Perfect Fit for gaps that were larger than all the data already processed.
- Bugfix in "-a 6" (move to end of disk). Files in zone 1 would not be moved.
- Added some translations of "Program Files" to the build-in list of SpaceHogs
- Fixed a typo in the "System Volume Information" string in the SpaceHogs.
- Fixed the displaying of the zone number, should have been + 1.
- For programmers:
- Changed the "makefile.bat" script, "JkDefrag.exe" does not need to be linked with "JkDefragScreenSaver.res".

一個免費的基于GNU General Public License的Windows磁盤整理和優化軟件，支持Windows 2000/2003/XP/Vista/X64。全自動并非常易于實用，并支持USB磁盤和存儲卡的整理，它利用微軟的標準磁盤整理API制作，整理磁盤徹底，對NTFS的兼容性好并且不損害數據。

Download: JkDefrag 3.16 
Download: JkDefrag 3.16 (Windows x64)
HomePage: JkDefrag Home Page

JGDefragGUI, This program is a GUI for the Opensource Defrag program jkdefrag.

Download: http://www.paehl.com/open_source/?JGDefragGUI