-Does your computer fail to bootup?
-Does your computer freeze and reboot?
-Cannot access your data due to the lost password?
-Does your computer contain critical data?
-Don't have a recent backup?
-Reformatted your harddrive?
-Accidentally deleted files?

Our blog will provide the relevant information on free tools, techniques, and approaches to recover your computer and get your valuable data back.

Freeware Portable Defragmenter JkDefrag and its Clones

About JkDefrag

JkDefrag is a disk defragmenter and optimizer for Windows 2000/2003/XP/Vista/2008/X64. Completely automatic and very easy to use, fast, low overhead, with several optimization strategies, and can handle floppies, USB disks, memory sticks, and anything else that looks like a disk to Windows. The presented Windows version is intended for Harddrives only. For defragmentation of floppy disk and removable media you need use command line version that can be downloaded from the author’s website. Add the appropriate drive letter to the end of the command path or else JkDefrag automatically will skip these.

Note: Just a side note that there is no big advantage in defragmenting USB drives due to the random data access. Furthermore, there were several warnings from the USB drives manufacturers, that the defragmentation process might harm the USB drive structure.


JkDefrag is completely free, no cost, no time limit. The executables are released under the GNU General Public License.


There is no "setup" or "install" and no configuration file. All you have to do is download the zip and unpack anywhere you like. The program is ready to run and will automatically process all the mounted, writable, fixed volumes on your computer. It is correct - you just start the program, and it will proceed with disks defragmentation even without pressing start button.


JkDefrag needs "full control" permissions to all files and disks that it must defragment/optimize. On a default Windows system the "administrator" userid has full permissions to all files and disks. Users with no administrator privileges can also run JkDefrag, but then it can only defragment/optimize the files and disks for which the user has "full control".
Note: On Vista right-click the JkDefrag program and select "run as administrator".


JkDefrag can be stopped safely at any time, there is no risk of losing data or corrupting your disk. You can use all the usual ways to stop a Windows program, such as pressing ALT-F4, clicking the ’x’ in the top-right corner, via the pull-down menu in the taskbar, or by killing the program via the task manager or another utility. It may take a bit of time for the program to actually stop, JkDefrag will finish the current file in the background.


JkDefrag writes all messages to a logfile called "JkDefrag.log". You can inspect the logfile if you want, it’s a flat-text file. The logfile is automatically cleared when the program starts, it does not grow to infinity.


1. Cleanup old junk from your harddisk before running JkDefrag, for example with "Start -> Programs -> Accessories -> System Tools -> Disk Cleanup", or with some freeware program.

2. Reboot before running JkDefrag. This will release files that are in use, so they can be defragmented. You can also run JkDefrag in Windows safe mode (press F8 while booting) to defrag even more files.

3. Stop your real time virus scanner before running JkDefrag. Virus scanners check all disk activity, making defragmentation and optimization very slow.

4. Move the swap file to another volume, reboot, defragment, and move the swap file back. If you don’t have a second volume then temporarily make the swap file small, for example 100Mb.

5. If an application (for example a database) prevents certain files from being defragmented then stop the application, run JkDefrag for the particular data directory only, and restart the application.

6. Package unused files with any packager. The package-file not only takes less harddisk space, but will also defragment and optimize much faster than the individual files. This does not apply to Windows NTFS compression, which will actually make defragmentation and optimization a lot slower.

7. Buy the biggest harddisk you can afford. Investing in a bigger harddisk gives more speed-per-dollar than investing in a faster CPU or more memory.

8. The first partition on a harddisk is significantly faster than other partitions. Try to use other partitions only for "SpaceHog" data.

9. If you have 2 physical harddisks (of the same speed), then place the pagefile on the first partition of the second harddisk.

Website: http://www.kessels.com/JkDefrag/

Download: http://www.ziddu.com/download/4026710/JkDefrag-3.36.zip.html

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As you might notice, the interface is simple and basic. There are power users, who prefer having more power of using the program, while having the Windows interface instead of command line. For them, I can offer JkDefragGUI freeware utilities.

JkDefragGUI is a Graphical User Interface which allows you to easily select all the features JkDefrag. But is can do a lot more. JkDefragGUI can schedule a defragmentation, install JkDefrag or it’s screensaver but can also do some small maintenance to your computer. It can be used to schedule a defragmentation of your system files like pagefile and registry files. JkDefragGUI also supports CCleaner which can be used instead of the internal cleaning function. It can also erase any information which is left behind on your hard disk after erasing files. JkDefragGUI was created for people who don’t have the skills of an advanced user but still want to use the powerful features JkDefrag has to offer or for those people who like a GUI instead of using the command line. JkDefragGUI is compatible with Windows 2000, Windows XP, Windows Vista, Windows 2008, U3 capable flash memory and with BartPE pre-installed environment.

Website: http://www.emro.nl/freeware/

Author: Emiel Wieldraaijer

Download: http://www.ziddu.com/download/4026776/JkDefragGUI103.zip.html

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There is one more utility with the same name JkDefragGUI, resolving the task to bring more visibility to multiple options of the basic JkDefrag. This utility is portable as well and supports many languages. Standard package include 10 languages, but you can download extra multi-language packages for additional 40 languages.

Website: http://jkdefrag.8qm.de/english.php#1

Author: Markus Hörl

Download: http://www.ziddu.com/download/4027088/JkDefragGUI_v1.16.zip.html

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And for the users, who are in favor of the AIO (all-in-one) bundles, there is another utility, combining all vital system management utilities under one roof. ScanDefrag is a small windows application that configures Microsoft’s, Norton’s, or JKessel’s disk utilities as part of the next Windows’ startup process. This can result in less restarts and cleaner runs of these programs. ScanDefrag Standard allows performing scheduled system maintenance using:

  • Microsoft’s Disk Cleanup
  • Microsoft’s ScanDisk/ChkDsk or Norton’s Disk Doctor
  • Microsoft’s Defragmenter, Norton’s SpeedDisk, or Jeoren Kessels’ Defragmenter
Note that this software is not portable, and requires installation on your PC. However, it is packed with several utilities, which are considered the best in their categories, so for many users it might be considered as comprehensive preferable solution.

Website: http://www.blueorbsoft.com/scandefrag/

Download: http://www.ziddu.com/download/4026833/ScanDefrag56Setup.exe.html

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