O&O Defrag

Supported systems:Windows 11, 10, 8 64-bit versions

O&O Defrag Professional is a great program for defragmenting disks. It includes a number of advanced features including a choice of different defragmentation strategies and automatic detection of the best settings for your system.


It can either defragment in manual mode, or you can let the program run in the background and defragment continuously. You can schedule defragmentation to run automatically at night time. O&O Defrag Professional can also defragment the disk according to criteria such as boot time and much more.

Frequent saving, modifying and deleting of files leads to their breaking into small parts or fragments that are scattered all over the disk and thus leads to loss of system performance.
O&O Defrag solves precisely the problems of loss of performance and stability by rejoining and reordering file fragments to restore lost performance and allow your hardware to run efficiently again.

Main features of the program

• Automatic detection of the optimal configuration for each system
• detailed reports on the actions performed in the defragmentation process
• Full support for new Windows XP features (Layout.ini) and online defragmentation of important system files (Master File Table)
• integrated STEALTH technology enabling exceptionally fast defragmentation running in the background
• O&O ActivityGuard Professional for system load monitoring and
• Customization of the usability of system resources by O&O
• Defrag
• optional integration with Microsoft Management Console
• automatic defragmentation timing
• defragmentation of paging file, registry, Master File Table (MFT)
• on NTFS and any other files that are locked at runtime
• and many others.