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JkDefrag is a free open source disk defragmenting utility computer program for Windows. It was developed by Jeroen Kessels beginning in 2004〔Information obtained from product release notes: history.txt file〕 and is released under the GNU General Public License. The "Jk" part of the utility name is taken from the developer's name, Jeroen Kessels. In 2008, from version 4, much changed from previous versions; JkDefrag was renamed MyDefrag by its developer, and JkDefrag was discontinued, although still available. MyDefrag is closed source freeware. == Operation == 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.〔(【引用サイトリンク】 JkDefrag v3.36 )〕 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) 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 FAT and NTFS filesystems. It uses the standard Windows defragmentation API. User support was provided through web-based forums. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「JkDefrag」の詳細全文を読む スポンサード リンク
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