Optimize your HDD and you can experience speed increases of up to 100%

O&O Defrag Pro

O&O Defrag Professional 18.0 (32-bit)

  -  23.99 MB  -  Trial

Sometimes latest versions of the software can cause issues when installed on older devices or devices running an older version of the operating system.

Software makers usually fix these issues but it can take them some time. What you can do in the meantime is to download and install an older version of O&O Defrag Professional 18.0 (32-bit).


For those interested in downloading the most recent release of O&O Defrag Pro or reading our review, simply click here.


All old versions distributed on our website are completely virus-free and available for download at no cost.


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  • O&O Defrag Professional 18.0 (32-bit) Screenshots

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What's new in this version:

- The new O&O Defrag 18 is now integrated into our Cloud IT Management solution O&O Syspectr!

Important Features at a Glance:
- Up to 100% increased performance: If you spend a lot of time on your PC, slow system and program starts or system crashes while playing can be very frustrating. Periodic defragmentation often works wonders in bringing new life to a PC.

New: Lifetime Performance Statistics:
- You can now see in detail the lifetime performance statistics of O&O Defrag, from the moment you bought the program to the current moment.
- These statistics show you just what O&O Defrag is doing for your PC, and exactly what it has already achieved so far!

New: Deleting free space on hard disks for your privacy:
- Privacy in capital letters: O&O Defrag 18 can also be used for deleting free space on hard disks. This prevents traces of confidential data left over from partially-deleted or temporary files from falling into the hands of any strangers.
- Simply let O&O Defrag 18 Pro confidential data securely automatically after a defragmentation run.

Performance increases of up to 100% are not uncommon:
- O&O Defrag activates the hidden performance of your computer and packs file fragments efficiently and securely together. O&O Defrag gives you everything from fully automated defragmentation to a professional set up: everything a good defragmentation software should give you.
- A continuous sorting of files on hard disks means they can be read quicker by Windows, which in turn accelerates all the read and write accesses by up to 100%.

Shorter defragmentation times and faster system and program starts:
- With O&O Defrag 18, several drives can be defragmented simultaneously. In addition, the algorithms have been substantially accelerated, reducing the time required for a defragmentation by up to 40%.
- By using O&O Defrag, files can be read and written much more quickly. What at first seems to be lost performance can easily be rediscovered and realized again with O&O Defrag, giving you the peace of mind that your hardware is in good health and operating optimally.

Automatic defragmentation in the background:
- O&O Defrag works quietly in the background so that the defragmentation process does not disturb other tasks and has no negative performance impact on your systems.
- The O&O ActivityMonitor periodically determines the system load. It controls the performance demand of O&O Defrag during a defragmentation and adapts it to the current state. You can thereby work undisturbed while your system is being defragmented in the background.

Manufacturer-independent optimization for SSDs:
- O&O Defrag makes it possible to optimize SSD drives through TRIM commands regardless of their manufacturer even under Windows XP and Vista. Access times for SSDs are sped up, and early wear and tear effects are prevented.