Start64!Free (released under the GNU General Public License) disk defragment and optimize utility for Windows 2000/2003/XP/Vista/X64. Completely automatic and very easy to use, fast, low overhead, with two optimization strategies, and can handle floppies and USB disks/sticks.

Included are a Windows version, a commandline version (for scheduling by the task scheduler or for use from administrator scripts), a screensaver version, a DLL library (for use from programming languages), and versions for Windows X64.

 JkDefrag - x64 version

There is no "setup" or "install" and no configuration file. All you have to do is download the zip and unpack. It contains the following 3 programs:

  • JkDefrag.exe
    Windows version. This is what most people will use. No installation or configuration necessary, it's ready to run and will automatically process all the mounted, writable, fixed volumes on your computer
  • JkDefragCmd.exe
    Commandline version. Specially designed to be run automatically in the background, or from administrator scripts. See the "running" chapter below for a list of commandline options, and the "Frequently Asked Questions" on how to run it automatically with the Windows Scheduler.
  • JkDefragScreenSaver.scr + JkDefragScreenSaver.exe
    Screen saver version. Move (or copy) these two files to the "system32" folder on your harddisk (usually "c:\Windows\System32\" or "c:\Winnt\System32\"). It will automatically become visible in the list of screensavers as "JkDefrag screensaver" and can be used just like any other screensaver (right-click somewhere on your desktop and select Properties, then select the Screen Saver tab).  

JkDefrag - x64 version

The Windows version of JkDefrag shows a high-detail map of the harddisk, refreshed 3 times per second. Bottom-left of the window is the beginning of the harddisk. The colors used are:

  • Black: empty
  • Dark-green: in use
  • Green: defragmented
  • Yellow: fragmented
  • Red: unmovable
  • Pink: system files
  • White: busy

JkDefrag - x64 version
JkDefrag - 64bit software