JkDefrag is a disk defragmenter and optimizer for (x64 bit) versions of Windows XP/Vista/2008 . Completely automatic and very easy to use, fast, low overhead, with several optimization strategies, and can handle floppies, USB disks, memoitry sticks, and anything else that looks like a disk to Windows. 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).

JkDefrag is a free (released under the GNU General Public License) disk defragment and optimize utility for Windows.

Completely automatic and very easy to use, fast, low overhead, with two optimization strategies, and JkDefrag ia able to handle USB disks/sticks and floppies.

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 64-bit Windows.

JkDefrag is based on the standard defragmentation API by Microsoft, a system library that is included in Windows 2000, 2003, XP, and Vista.

All defragmenters are based on this API, including commercial defragmenters. JkDefrag is therefore very solid and there is no risk of losing data.

You can stop the program at any time, it will finish the current file in the background.

If your disks use NTFS then you're even safe when the computer crashes in the middle of defragging.

Nevertheless, it's still a good idea to backup before defragmenting, just like with other defragmenters, because the heavy use of the harddisk may trigger a hardware fault.

News:

· Reverted back to an old Microsoft Screensaver library. The 2008 compiler has a library that is incompatible with Windows XP ("The procedure entry point ChangeWindowMessageFilter could not be located in the dynamic link library USER32.dll").
· Fixed a problem with extremely long path names.