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Concept
JkDefrag
Summary
JkDefrag is a free open-source disk defragmenting utility computer program for Windows. It was developed by Jeroen Kessels (initials "JK", hence the name) beginning in 2004 and was released under the GNU General Public License. Since version 4 of 2008, much changed from previous versions, JkDefrag was renamed MyDefrag by its developer; earlier JkDefrag versions continued to be available. MyDefrag, which was closed source freeware, was discontinued, with the last version being v4.3.1, file date 21 May 2010; for several years the MyDefrag website has been a redirect to the still-existing JkDefrag site, but links to downloadable JKdefrag files are dead.
JkDefrag has many options. If run without options it groups files into 3 zones with the intention of optimizing speed:
Directories and system files
Regular files
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.
JkDefrag characteristics:
Both command-line & graphical executable programs, about 500k bytes 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;
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 and NTFS filesystems.
Official source
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