3.5 stars

Editor's Rating


User Rating

2 2


disk defragmenter MyDefrag (formerly JkDefrag) is a disk defragmenter that can be run in as-needed or automatic mode via command-line parameters or screensaver integration. By default, the program uses a Fast Optimization, designed for everyday use, but it also supports custom parameters that can move files to the end (or beginning) of the disk, sort them by name, size and other criteria. Even though MyDefrag can be run with a standard Windows GUI, most of it`s strong features are aimed at users that are familiar with command-line usage. As of versions 4, the program also includes a scripting language and extensive customization features. Copyright

Win (All)

Product Details

Publisher J.C. Kessels Price Free
Version 4.3.1  history Last updated May 21, 2010
File Size 1.98 Mb Requirements None

User Reviews

5 stars43% 7
4 stars37% 6
3 stars6% 1
2 stars6% 1
1 star6% 1
Based on 16 reviews

Latest user reviews:

Good for 32bit, not for 64bit 3 stars by realbull2009250 Jul 07, 2015 (Read all my 57 reviews)
This is my 2nd review after using it for Win7 64bit. I've used this for 32bit OS and it worked very well. It utilizes the Windows API for moving files while defragmenting which is why it is slower than other defragmenters. The options(scripts) are easy to use. You can defrag, optimize and weekly to monthly defrags. To get more options you will have to use the command-line version or create scripts for it. Recently I used MyDefrag 64bit version on 64bit OS and noticed that my restore points were severely defragmented, up to 16,000+ fragments! Also many other files where not defragmented, but even more defragmented. In the end I had less HD space. I checked my restore points and they where all gone except for the last one. MyDefrag and some other defragmenters used on 64bit will break up restore point files causing them to be not deleted, but unrecognized and unusable on Windows. Also MyDefrag ceased development, so there will be no fix for this issue. MyDefrag is great on 32bit systems. It runs well, easy to use and safe to use. But, because of the issue it has on 64bit OS I cannot recommend it for 64bit systems. For 64bit systems it is best to use another defragmenter that will actively release updates to resolve bugs and will not destroy restore points. show Review details
The best just got better 4 stars by thosthos Oct 21, 2009 (Read all my 2 reviews)
I've used the most popular commercial and freeware defragmenters over the years and kept coming back to JKDefrag, because it was safe, effective, and free. MyDefrag is better; it is faster, mainly because of improved optimization based on 5 zones rather than 3. The scripting gives any user the level of sophistication they need. I only use the supplied weekly and monthly scripts. They make my disk very fast. There are a few issues with this software, but bugs (not critical) are being fixed at a furious pace. I am using 4.2.3 and consider it excellent and stable. show Review details
Same problem ! 1 stars by Shodan816 Aug 27, 2008 (Read all my 38 reviews)
I reviewed this product over 9 months ago and gave it a poor rating because it totally wiped out all of my Vista restore points. Now here we are 9 months later and V3.35 does exactly the same thing ! Great... If you are a Vista user, you have been warned! show Review details
Read all 16 user reviews...

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