September 19, 2017

O&O Defrag Professional 21.0.1115


O&O Defrag Professional Icon

O&O Defrag Professional 20 is a powerful and effective defrag utility, that can optimize the partitions of your hard disk by reconstructing scattered file fragments, which result in improvement of your overall computer's performance.

When you defragment, the files that Windows splits up when saving documents across the hard disk are logically put back together again so that files can be quickly recognized and found by the read and write heads inside your hardware. Speed increases of up to 100% are not uncommon, and your hardware suffers much less wear and tear!

O&O defragmentation tool includes a clever scheduling function, which allows you to schedule regular automated defragmentations if you wish. In addition, the permanent and automatic optimization in the background is key to prevent a loss in performance of your computer as well as a renewed fragmentation. This will allow you to save time compared to running a manual defragmentation.

O&O Defrag also features a built-in O&O DiskStat that offers a quick overview of how the hard drive is used. Users can easily search for files or folders that are taking up valuable disk space on the hard drive and slowing down your system. This versatile tool offers a Windows - Explorer type intuitive interface and a variety of options to hunt for space wasters.

The program uses 100% Microsoft Windows API’s to move and rearrange data and files. Thus performing defragmentation processes with the software is as safe as running the Windows system itself and for example moving a file with the Windows explorer.

O&O Defrag is fully integrated with O&O DiskStat 3! O&O DiskStat analyses how your hard disks are being used. It lets you track down those files and folders that are taking up too much space on your hard disk, and causing your computer to slow down. You can sort by category, file type, view them in Explorer and export them as a table and then target those files you want to defragment. Interactive diagrams and top lists round off the features.

O&O Defrag is offered in three editions (Compare Features):

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Key Features:
  • User-friendly and modern interface
  • Extends the life of your hardware
  • Prevents new fragmentation from occurring
  • Defrag multiple drives simultaneously
  • Automatic background defragmentation
  • Increases chances of recovering lost files
  • Power Management for Notebooks
  • TRIM commands for SSDs of any brand
  • Complete Automation with O&O OneButtonDefrag
  • Schedule Disk defragmention
  • Built-in O&O DiskCleaner
  • Highly configurable
  • Great Performance


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Last Update: September 19, 2017

Current Version: 21.0.1115

License: Shareware

Languages: English, German

Supported Operating Systems:
Windows Vista / 7 / 8 / 8.1 / 10 / Server 2003 / Server 2008 / Server 2012 (32-Bit, 64-Bit)

Developer: O&O Software GmbH

Homepage: OO-Software.com
With O&O Defrag 21, we’re releasing the latest version of our tuning program to resolve these very problems, especially as they affect older PC systems. 20 years after the release of the first O&O Defrag in 1997, we’ve managed to improve O&O Defrag 21 even further.

Faster file access The defragmentation algorithms have been improved with a view to saving the system resources and a better strategy when placing the files for even faster file access

Find large and superfluous files and get rid of them In addition, O&O DiskStat 3 is available free of charge for O&O Defrag users as a standalone application for finding and removing large and unnecessary files, in order to be able to clean up with a few clicks in case of storage shortage.

Optimized Disk Cleaning As requested by many customers, the O&O DiskCleaner function has been optimized once again in O&O Defrag and now allows for the automatic deletion of superfluous files in combination with a subsequent defragmentation for the maximum gain in performance.

Virtual Machines More than that, there's been further development in the optimization of virtual machines in O&O Defrag 21 for our corporate customers. Along with defragmentation on virtual machines, it's also possible to defragment a file on the host to achieve the best possible performance on both host and the virtual machine itself.