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UltraDefrag is a useful utility capable to defragment your hard disk and improve the speed of your computer. This application can be used for both 32bit and 64bit version of Windows.

UltraDefrag is an open source disk defragmenter for Windows NT 4.0 and later operating systems. It makes use of the same defragmenting API used by many other windows defrag utilities, both open and closed source. However, UltraDefrag has many features that makes it unique. Firstly it has a kernel mode driver that does most of the work, secondly is the ability to run the application at boot up time in a manner similar to chkdsk. This allows for faster defragmentation time and the ability to defragment all files including system files. It can also defrag single file or multiple directory and can generate a list of all fragmented files. The program is available for both 32bit and 64bit version of Windows running on both AMD and Intel based processor.

Features of UltraDefrag 4.3:

- Defragmentation algorithm was completely rewritten to be more effective. Click To know more about the algorithm. Now UD is more reliable and effective.
- GUI configurator option to allow UD to be configured using a graphical window.
- Very fast defragmentation, the work is done via a kernel mode driver which has an optimal defraging algorithm.
- Single file or directory defragmentation ability. Select any file or folder in Explorer and choose the appropriate context menu item to defragment them.
- Debug logging feature - Program writes debugging information to %windir%UltraDefraglogs directory. That means if your windows is installed in drive "C" and directory name is "Windows", then logs can be found in C:/Windows/UltraDefrag/Logs.
- Very small engine written in pure C.
- PortableDefrag can be installed on demand which can be carried around in USB storage devices and used without any installation.
- Nice graphical interface - compact and functional.
- A new graphical configurator which allows access to help files, boot time defrag option and UD font settings.
0 Safety, because the file moving is accomplished with Microsoft's own Defrag API.
- Simple to use.
- Set program's filter to exclude unwanted files and folders from the analysis.
- Ability to generate html reports of fragmentation status.
- Ability to include/exclude files based on simple filters.
- Native x64 support.
- Free: Distributed with full source code under the GNU General Public License.
What's New in UltraDefrag 4.4.0 RC1:

- partial defragmentation was added to decrease number of fragments even when there are no free space on disk to hold all fragments of file together
- volume optimization algorithm was improved to prevent useless additional optimization passes
- one little bug preventing optimization from being stopped was fixed in driver
- volume optimization algorithm was improved to prevent skipping heavily fragmented parts of the processed volume
- progress is now added to the GUI window caption, so it is displayed in the tooltip of the taskbar icon
- cryptic single character progress label was replaced by the localized operation names
- file system type detection was rewritten to be more reliable and detect UDF-formatted volumes properly
- fixed a problem where the case of the names of the help pages launched from the configuration dialog did not match
- fixed a problem, where .lua files would get executed instead of edited, if "Lua for Windows" was installed
- 10 seconds delay is skiped on boot time scan, if only one keyboard is present
- added language selector to the GUI package
- Hindi translation was added
- the following translations were updated: Croatian, Danish, Dutch, French, Greek, Polish, Russian, Serbian, Swedish, Turkish


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