Auslogics Disk Defrag vs Defraggler

Edit: I wrote this post two and a half years ago. It is no longer relevant. Please don’t read it.


Just like the cables underneath your desk, things on your hard drive have a tendency to get tangled. Files fragments are scattered and things get harder and harder to find.

Thankfully, Windows has come with its very own Disk defragmenter since Windows 95, but many (faster) alternatives have been made available to the public.

In this review, I will be comparing AusLogic’s Disk Defrag and Piriform’s Defraggler.

User Interface

  • Auslogics Disk Defrag
Image: auslogics.jpg

Auslogics Disk Defrag features a minimalistic design. At the top, your disk drives are listed alphabetically by their drive letters. At the bottom, the selected disk is displayed as a grid.

  • Defraggler
Image: defraggler.jpg

Defraggler’s User Interface is very similar to that of Auslogics Disk Defrag. Drives are listed at the top; a grid is show underneath it. However, Defraggler also shows information about your disk including

  • Used Space
  • Free Space
  • Capacity
  • List of files to be Defragmented
  • A simple file search function

In addition, Defraggler’s window is smaller and takes up less space than that of Auslogic’s.

The program with the best User Interface is

The primary purpose of a Disk Defragmenter is to defragment files, however, other functions are always nice.

  • Auslogic’s Disk Defrag

Auslogics functionality is rather limited and simple. Both Auslogics and Defraggler have the ability to defragment single files or folders. They also include options for scheduling defrags and excluding files. But besides these basic functions, AusLogics has very little else to offer.

Image: auslogics2.jpg

Disk Defrag’s settings are simple enough for anybody to use, yet customizable to suit your personal needs.

  • Defraggler

Defragger is teeming with extra tools and options that provide much greater functionality.

Defraggler has a simple search engine to find files on your computer. Their search lets you input both filesnames and sizes to search for.

Image: defraggler2.jpg

Defraggler’s Scheduling options are almost identical to those of Auslogics Disk Defrag. Whichever one you choose, you shouldn’t have any problems scheduling automatic Disk Defrags.

Image: defraggler3.jpg

In terms of Functionality, the clear winner is

Whew, that was a hard word to spell. It took around 4 times to get “performance” right. One of the most important parts of a Disk Defragmenter is its performance while cleaning up your files. Windows’ built in defragmenter is sluggish and slow. In addition, it takes a great deal of CPU Power and memory to finish a defragmentation, not to mention the bizarre disk activity involved.

In terms of perfomance, I decided to run a little experiment. I ran both Disk Defrag and Defraggler on identical folders of extremely fragmented files.

Auslogics Disk Defrag finished in 19.2 seconds.

Defraggler finished in 24.5 seconds.

So, not a big difference, but Auslogics came out a few seconds ahead.

The winner for the Performance Test is
Auslogics Disk Defrag

I personally use AusLogics Disk Defrag most of the time, as it gets the job done faster. But, Defraggler’s extra funcions and nice GUI are nothing to laugh about. Take your pick~!

Defraggler Main Site

Auslogics Disk Defrag Website


23 CommentsAdd one

Roger Enthusiast
Tue, 30 May 2023 18:03:59 GMT

You told me to not read this article, so the first thing I did was read this.

gary winthorpe
Wed, 01 Mar 2023 20:04:44 GMT


Fri, 20 Jan 2023 20:32:31 GMT

Thats wonderfull

YOOOO HENRY (hi guys its 12/12/2022 6:44pm Florida)
Mon, 12 Dec 2022 23:44:14 GMT

YOOOOOOOOOO HENRY SOMMER no way bro we came here on the exact same day bro, God bless lmaoao and wish me luck on my finals lmao got them all this week 12/13/22,12/14/22,12/15/22,12/16/22 its rough. like henry said whoever reads this have a great day and greetings from sunny florida!!!

Henry Sommer
Mon, 12 Dec 2022 19:07:30 GMT

Year: 2022

Found a public board

Right before finals

Good luck to future generations who find this. May the earth rest lightly on you.

Fri, 14 May 2021 00:46:20 GMT

Hey Roger, are you doing ok?

Roger: Yep!

Thu, 18 Feb 2021 22:05:24 GMT

Im here I dont know why. Hello!

Wed, 06 Jan 2021 13:52:16 GMT

As you asked, I did not read your article. :D now gib me cookie or die tmr

Thu, 19 Dec 2019 17:40:30 GMT

Over the weekend I bought black crocs. They are men’s size 9 (Or woman’s size 11) They are black and I can’t wait to wear them! I even got the things you can attach to them!

Fri, 13 Dec 2019 18:45:31 GMT

How did I get here?

Are you a bot?
Tue, 18 Jun 2019 16:56:41 GMT

After scanning a lot of your comments Roger.exe, I've noticed you comment "Haha" a lot. So the real question is are you a bot?

Roger: Not entirely

Wed, 29 May 2019 22:55:28 GMT

you're not my mom roger, i'll read what i want
(nice article btw)

Roger: Haha

Negro Williams
Wed, 20 Jun 2018 03:44:55 GMT

Hey man, cool article.

Sun, 03 Jun 2018 20:36:43 GMT

don't go wasting my emotion

Danny Duncan
Thu, 10 May 2018 21:44:48 GMT

I applaud. You should be proud of all your work, no matter what. If not, your whole fanbase will support you and be proud of you.

The Future
Sun, 18 Dec 2016 00:27:01 GMT

Why are you ashamed of this wonderful article? It isn't relevant now but it once clearly was. Maybe. I wouldn't know.

Sun, 05 Feb 2012 18:02:38 GMT


Hi there. Thanks for the helpful criticism. The full timestamp of the post is visible when you hover over the "August 28th" date. It appears as a tooltip because of the title attribute. I wrote this over two years ago, and the direction of this blog has since changed.

For one thing, I no longer use Windows, and furthermore, I don't write product reviews or anything of the like anymore.

I'm sorry if this review offended you or anything, I was 14, and it is rather shallow. Thank you for your patience.

Sat, 04 Feb 2012 21:43:02 GMT

It would be courteous for an author of a review to note if they are testing or comparing freeware or payware versions. This author might've been mixing freeware with payware. For example, Piriform's Defraggler does NOT provide a scheduler. You have to run their df.exec from a command line and add it as an event in Task Scheduler. Of course, Windows own Task Scheduler is far superior to the one provided by either Auslogics or Defraggler.

There was omission of several feature comparisons between the Auslogics and Piriform defragmenters. For example, Auslogics says it will move normal files out of the MFT reserve area. When disk space is low, this reserved area (it's reserved for later use, if available, not allocated solely for use by the MFT) will be used for normal file storage and not be available to the MFT as more files are added hence fragmentation of the MFT. By clearing the MFT reserve area of normal files, further additions to the MFT will be contiguous instead of fragmented. The idea is to prevent future fragmentation of the MFT. This feature is missing in Defraggler (both freeware and payware versions). In fact, there is little feature-by-feature comparison in this review, just what the author happens to touch upon for his personal and limited use of the product(s).

Another missed feature is Defraggler can be scheduled to perform a boot-time defrag (in its freeware version). For Auslogics, you have to buy their payware version to get that feature. Defraggler can be configured (a global option, not a setting per defrag job) to run in normal or low priority. This prevents the defrag operation from interfering the use of your computer due to impacted responsiveness while defragmenting. This is a global option and not settable via command-line switches when using their df.exec to run scheduled defrags using Windows' Task Scheduler. If you only defrag using scheduled jobs (for when you won't be at the computer) then you'll probably want to leave priority at normal.

Tis a pity that blog-like reviews, like this one, don't bother putting the year in the time stamp. It's Feb 2012 as I write this and have to guess that the Aug review was performed in 2011 to omit having to show a year in the time stamp. Otherwise, this could be a really old review - especially since the revisions of the products was never mentioned - and features were changed since then. Without proper date stamps and the omission of product versions, readers really have no idea if the comparison is of value.

The freeware versions of both are adware because both default to installing foistware (software bundled in the installer), like the Google Toolbar (Defraggler) and Ask Toolbar (Auslogics). Be sure to do a custom install or review the installer's screens so you DESELECT this foistware during the install.

This turned out to be a lightweight overview review and not of much value for users that want an in-depth comparison between these products. They are close competitors so more should've been covered on each product to compare against the other, plus it really does matter if the freeware or payware versions were being compared as many features are missing from the freeware versions.

Wed, 04 Jan 2012 18:23:35 GMT

Thank you!. This comparison made it very clear, on which one I chose as my defragmenter. And I'll go with Defraggler, just cause it seems to be more efficient and in functionality. That's what I looking for on a Defragmenter to do the job well, not to do it fast!.

Invalid Conclusion
Tue, 07 Jun 2011 21:29:48 GMT

The performance test really isnt valid... just because one does it faster doesnt mean it does it better... not only is defrag time important but improved drive/file speed/access after?

still searching for the best.. nice site layout, mahalo

Tue, 04 Jan 2011 07:39:05 GMT

This is exactly the information I was looking for. Thanks for the comparison!

Mon, 27 Sep 2010 06:59:37 GMT

Those 2 are REALLY hard to compare to each other..I’m glad someone did something like this...

Mon, 26 Apr 2010 12:41:26 GMT

Great! I was looking for a comparative like this. Thank you :)

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Tue, 28 May 2024 16:11:07 GMT