Auslogics Disk Defrag v9.3

A Full Review of Auslogics Disk Defrag, a Free Defrag Program

Auslogics Disk Defrag is free defrag software for Windows with many great features, like simultaneous disk defragmenting and detailed per-file fragment listings.

This review is of Auslogics Disk Defrag version 9.3. Please let me know if there's a newer version I need to review.

More About Auslogics Disk Defrag

Auslogics Disk Defrag v9.0 in Windows 8
  • Windows 10, Windows 8, Windows 7, Windows Vista, and Windows XP users can all use Auslogics Disk Defrag
  • Auslogics Disk Defrag can integrate with the Windows right-click context menu so it's easy to defrag individual files and folders (and not just the whole hard drive)
  • Commonly used system files can be moved to the quicker part of the disk for faster read/write access
  • A Quick Defrag can be launched to make Auslogics Disk Defrag skip an analysis and go straight to a defrag
  • After an analysis or defrag, Auslogics Disk Defrag shows a list of every folder and file that contains fragments, making it easy to open it in Windows Explorer for further information

Auslogics Disk Defrag Pros & Cons

There's plenty to like about Auslogics Disk Defrag:


  • Completely free for personal use and in commercial settings
  • Really quick install
  • Can exclude files and folders from a defrag
  • Supports defragmenting more than one drive simultaneously
  • Search through every fragmented file
  • Check and correct errors on a drive
  • Defragment the master file table (MFT)
  • Set the defrag priority


  • Can't move custom files to the end of the disk*
  • No option to run a defrag on just the free space
  • Tries to add other programs to your computer during installation
  • Lots of extra features cost
  • Offline/boot-time defrags not supported

*Programs like Defraggler can move any fragmented file (like old files) to the end of the disk to make room for common files to reside at the front end for quicker access.

Moving System Files

Files can be located at the beginning of a disk, at the end, or somewhere between the two. The speed at which you can open and modify files depends on their location on the drive.

If a particular file is at the beginning, opening and writing to that file is quicker versus if it were on the further end of the drive.

Auslogics Disk Defrag can move system files to the front of the disk so you can read and write to them quicker, essentially giving them higher priority than other file types. This speeds up the overall performance of the computer. However, as I noted above, this process is only applied to certain files and not custom ones you choose yourself.

Several different system files are moved, such as the following: the SAM file, every event viewer log file, and DLL, EXE, SYS, and OCX files in the %WINDIR%\System32 folder.

Access this option in the settings under the Disk Defrag: Algorithm tab. The option you should enable is called Move system files to the beginning of the disk, which isn't selected by default.

While this is useful, again, it's unfortunate you can't move your own files to give programs or other common extensions priority over the rest of the files on your hard drive.

My Thoughts on Auslogics Disk Defrag

Given the many features and pros listed above, Auslogics Disk Defrag is obviously one of the better defrag programs out there right now.

However, one thing I can think of that would push Auslogics Disk Defrag over the edge to make it the best free defrag program would be one thing; the ability to move any file you want to the front of the disk, not just system files.

While this feature isn't supported, I am glad it moves common system files to a quicker part of the disk. It may just be a placebo effect, but my computer actually seems quicker after enabling this option. Actually, I was reportedly left with a zero fragmentation level, which is of course what we're after.

Some other improvements we'd like to see happen with this free defrag program is fewer paid features. In older versions of this software, temporary files could be deleted before a defrag to speed up the overall process, you could run defrags before the OS started, it supported optimizing the drive, and you could perform idle defrags—none of those features are free in the most recent edition of Auslogics Disk Defrag.

Disk wiping and automatic maintenance are some other paid-only features.