Download Auslogics Disk Defrag for Windows PC v12.3.0.1 for Windows PC

Auslogics Disk Defrag defragments hard drives and optimises file placement for faster access, with SSD-aware optimisation, free-space consolidation...

Features

• Defrag & Optimize consolidates scattered free space into one block while it defragments, so newly created files are less likely to fragment again straight away.
• You can defragment a single file or folder instead of a whole drive, which is much faster when one large game install or disk image is the actual problem.
• The fragmentation report and drive map list exactly which files are most fragmented and where their pieces sit, making results easy to verify rather than trust.
• Built-in scheduling keeps a mechanical drive maintained automatically, and the program can create a portable version on a USB drive for use on other computers.
• SSDs are detected and given a dedicated optimisation profile instead of a traditional defragmentation pass that would waste write cycles.

Considerations

• Defragmentation only benefits mechanical hard drives; on the SSDs most modern PCs use, Windows' built-in maintenance already does what is needed.
• The free edition promotes the paid Pro version and other Auslogics products inside the program, which can feel like advertising.
• A full Defrag & Optimize run on a large, heavily fragmented drive can take a long time and is best left to run while the PC is idle.

On a mechanical hard drive, a fragmented file is stored in pieces scattered across the platter, and the drive wastes time seeking between them. Auslogics Disk Defrag first analyses the drive and shows the result on a drive map with a per-file fragmentation list, so you can see exactly which files are most fragmented rather than trusting a progress bar. The defragmentation pass stitches files back together, and Defrag & Optimize goes further: it consolidates scattered free space into one contiguous block, so newly written files are less likely to fragment straight away, and rearranges frequently used files for faster access. When one large game install, game folder or virtual disk file is the actual problem, you can defragment a single file or folder instead of running the whole drive — a much faster route to the specific slowdown you noticed. Version 12.3.0.1 is, for the audience still running spinning disks, noticeably more capable than the defragmenter built into Windows.

Defragmentation only benefits mechanical hard drives, where data is read by a moving head. On an SSD, access is electronic, traditional defrag gains nothing, and it wastes write cycles — which is why modern builds of Auslogics Disk Defrag detect SSDs and apply optimisation algorithms suited to solid-state drives instead of a traditional pass. Windows 11 already includes Optimize Drives, which defragments mechanical drives and runs SSD maintenance automatically, so this tool is an optional alternative with a more visual drive map, better scheduling and a portable mode — not a necessity. Its audience is the shrinking but real set of PCs still running spinning disks, especially older machines where fragmentation is a genuine cause of slowness. The honest summary: it is maintenance for a specific kind of drive, not a general speed-up for every PC.

Two features suit people who maintain more than one PC. Built-in scheduling keeps a mechanical drive defragmented automatically in the background, and the program can create a portable version on a USB stick for use on other computers — genuinely handy if you fix family PCs. The free edition covers everyday defragmentation for personal use, while a paid Pro edition adds deeper optimisation options. The trade-offs are about relevance and noise rather than competence: the free edition promotes the paid Pro version and other Auslogics products inside the interface, which some users will find noisy, and a full Defrag & Optimize run on a large, heavily fragmented drive can take a long time, so it is best left running while the PC is idle. It runs on Windows 7 through 11 (32-bit and 64-bit) with 1 GB of RAM and 100 MB of space.

Download the Auslogics Disk Defrag setup program (version 12.3.0.1) from Auslogics using the button above and save it to your Downloads folder.

Double-click the downloaded EXE and follow the setup wizard, choosing your language and install folder; read each screen and untick anything you do not want before confirming.

Launch Disk Defrag, select a mechanical hard drive and run Analyze first to see fragmentation, then choose Defrag or Defrag & Optimize; SSDs are detected and offered optimisation instead of a full defrag.

Is Auslogics Disk Defrag for Windows PC free?

Yes. Auslogics Disk Defrag for Windows PC is freeware, so it is free to download and use at no cost. It is proprietary software from Auslogics Software Pty Ltd rather than open source, so its source code is not publicly available.

What is the best free Disk Defragmenter for Windows 11?

Auslogics Disk Defrag is a credible free choice for a mechanical hard drive. Its free edition analyses fragmentation, defragments files and consolidates free space, with a drive map and per-file list that show more than the built-in Windows tool. An SSD does not need traditional defragmentation.

Is Auslogics disk defrag good?

Yes, for PCs still using a spinning hard drive. Version 12.3.0.1 is clearer and more capable than the basic Windows defragmenter, especially when you want to see which files are fragmented. It is much less relevant on an SSD, where Windows maintenance is the right tool.

Does Windows 11 still have defrag?

Yes. Windows 11 includes Optimize Drives, which defragments mechanical hard drives and runs SSD maintenance automatically. Auslogics Disk Defrag is an optional third-party alternative with a more visual drive map, scheduling and a portable mode.

Is defragging a PC still a thing?

It still matters on a traditional hard drive, where defragmenting and consolidating free space can reduce mechanical seeking. It is no longer a routine tune-up for most PCs because SSDs access data electronically and do not benefit from traditional defragmentation.