JkDefrag

JkDefrag has many options. If run without options it groups files into 3 zones with the intention of optimizing speed:

1. Directories and system files
2. Regular files
3. Large files referred to as "space hogs" in the documentation

Files outside their zone are moved to their zone. Directories are perhaps the most accessed data on disk, so zone 1 is placed at the beginning of the drive. After the directories comes a free space area, then zone 2 with regular files, another free area, and then zone 3 with "space hogs", which are large files, archives, Recycle Bin contents, service pack files, and other infrequently accessed data.{{cite web |url=http://www.kessels.nl/JkDefrag/index.html |title=JkDefrag v3.36 |first=Jeroen |last=Kessels |url-status=dead |archive-url=https://web.archive.org/web/20150215060146/http://kessels.nl/JkDefrag/index.html |archive-date=2015-02-15}}

JkDefrag characteristics:

• Both command-line & graphical executable programs, about 500 kilobytes total size;
• Automated operation;
• A range of command line interface options, allowing for scheduled defragmentation with administrator scripts;
• No need for installation; runs with default options by opening JkDefrag.exe;
• Screensaver defragmentation, with the option to run another screensaver when done;
• Source code (Microsoft Visual C++ 2005 for 32-bit version and Microsoft Visual C++ 2008 for 64-bit version) available;{{cite web |title=JkDefrag version 3.36 source code |trans-title= |website=sourceforge.net |publisher= |url=https://sourceforge.net/projects/winpenpack/files/winPenPack_Suites/sources/4.4/Programs/JkDefrag/JkDefrag-src-3.36.zip |format= |accessdate=2016-07-13 |last= |date= |year= |language=German |pages= |quote=}}
• A DLL library (for use in programming) licensed using the LGPL;
• Support for 64-bit versions of Windows XP and Vista with native x64 binaries;
• Documentation available on the web site.

JkDefrag runs on the Windows 2000/XP/2003/Vista operating systems, and defragments both FAT and NTFS filesystems. It uses the standard Windows defragmentation API. Because of that, it could technically even be used on operating systems up to Windows 11. However such use would be completely unsupported and might bear the risk of data loss or a corrupt OS or other severe problems. User support was provided through web-based forums.

There are several graphical user interface utilities designed to work with JkDefrag:

• JKDefrag Option GUI by Emiel Wieldraaijer includes support for 26 languages, and has support for BartPE and U3 implementations.{{cite web |url=http://www.freewaregenius.com/2007/07/31/jkdefrag-gui/ |title=JkDefrag GUI |work=Software Genius |date=31 July 2007 |first=Samer |last=Kurdi |access-date=1 September 2009 |archive-url=https://web.archive.org/web/20090415213226/http://www.freewaregenius.com/2007/07/31/jkdefrag-gui/ |archive-date=15 April 2009 |url-status=dead}} It was also nominated "Repair Tool of the Week" in TechNibble in August 2007.{{cite web |url=http://www.technibble.com/repair-tool-of-the-week-jkdefrag-gui/ |title=Repair Tool of the Week: JkDefrag GUI |work=Technibble |date=7 August 2007 |first=Bryce |last=Whitty}}
• JkDefragGUI by Markus Hörl is portable, includes support for 10(+30) languages, and there is a setup version.
• ScanDefrag supports JkDefrag and allows it to run during Windows startup.

The only other Windows-based defrag program with a GNU GPL is UltraDefrag before version 8.

{{Portal|Free and open-source software}}

• File system fragmentation
• List of defragmentation software

{{Reflist|1}}

• {{cite journal |title=Boxed Utility Blowout |journal=Computer Power User |url=http://www.computerpoweruser.com/editorial/article.asp?article=articles%2Farchive%2Fc0709%2F31c09%2F31c09.asp |date=September 2007 |pages=66–68 |volume=7 |issue=9}}
• {{cite web |title=Freeware/Open Source for Windows Weekly Summary |first=Todd |last=Ogasawara |work=O'Reilly Windows Devcentre |url=http://www.oreillynet.com/windows/blog/2007/07/freewareopen_source_for_window_33.html |date=12 July 2007}}
• {{cite web |title=Defragmentation freeware outpaces native tools in Windows |first=Serdar |last=Yegulalp |url=http://searchwindowsserver.techtarget.com/tip/0,289483,sid68_gci1247255,00.html |date=13 March 2007 |work=SearchWindowsServer.com |access-date=2 September 2009 |archive-date=9 April 2010 |archive-url=https://web.archive.org/web/20100409094430/http://searchwindowsserver.techtarget.com/tip/0,289483,sid68_gci1247255,00.html |url-status=dead}}
• {{cite journal |title=Must-have Windows utilities for 20 essential tasks |first=Serdar |last=Yegulalp |url=http://www.computerworld.com/s/article/9025855/Must_have_Windows_utilities_for_20_essential_tasks |journal=Computerworld |date=12 July 2007}}
• {{cite web |title=Two top defraggers speed your disk accesses |first=Scott |last=Spanbauer |work=Windows Secrets |date=12 June 2008 |url=http://windowssecrets.com/2008/06/12/05-Two-top-defraggers-speed-your-disk-accesses |access-date=1 September 2009 |archive-url=https://web.archive.org/web/20100102011516/http://windowssecrets.com/2008/06/12/05-Two-top-defraggers-speed-your-disk-accesses |archive-date=2 January 2010 |url-status=dead}}

• {{Official website|http://www.kessels.com/JkDefrag/|JkDefrag official website}}
• [http://www.mydefrag.com/ MyDefrag website (defunct; 2016)]
• [https://web.archive.org/web/20150923174633/http://www.mydefrag.com:80/ MyDefrag website on archive.org (Sept 23 2015)]
• [http://www.mydefrag.net/ JKDefragGUI and MyDefragGUI related front-end project]

Category:2004 software

Category:Free defragmentation software

Category:Windows-only free software

Category:Utilities for Windows