MyDefrag (formerly JKDefrag) is a disk defragmenter and optimizer for Windows 2000/2003/XP/Vista/2008/X64. Completely automatic and very easy to use, fast, low overhead, with several optimization strategies, and can handle floppies, USB disks, memory sticks, and anything else that looks like a disk to Windows.
| Version | 4.3.1 |
| Operating System Support | Windows 10, Windows XP, Windows 2003, Windows 8, Windows 2000, Windows 7, Windows Vista |
| Current Language | English |
| Available Languages | English, French, Polish, Chinese, Italian, German, Japanese, Spanish |
| License | Free |
| Date | Friday, May 21st 2010 |
| Developer | J C Kessels |
| Developer URL | https://www.mydefrag.com |
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), versions for Windows X64, and the complete sources.
Why use this defragger instead of the standard Windows defragger?
- Much faster.
- Totally automatic, extremely easy to use.
- Optimized for daily use.
- Disk optimization, several strategies.
- Directories are moved to the beginning of the disk.
- Reclaims MFT reserved space after disk-full.
- Maintains free spaces for temporary files.
- Can defragment very full harddisks.
- Can defragment very large files.
- Can defragment individual directories and files.
- Can be run automatically with the Windows Scheduler.
- Can be used from the commandline.
- Can be used as a screen saver.
- Can be run from cdrom or memory stick.
- Sources available, can be customized.
JKDefrag was open source, but from version 4, when it changed its name to MyDefrag, it is closed source.