O&O Defrag Professional Editon is a powerful tyool used for defragmnenting partitions, thus optimizing your computer’s performance.



The user interface is easy to follow. It has a ribbon bar that display’s all possible actions made in O&O, a list of available local drives and a few tabs: Cluster View, History of Defragmentation, Drive Status, Jobs, Reports and the File Status.



The Cluster View display’s the amount of clusters arranged graphically as a block. The blocks are shown in priortized colors – Free, Compressed, Allocated, Fragmented, Reserved for MFT, System, Paging File, Locked Exclusively, Being Processed and Folders.



Shadow Copy is a feature that automatically creates copies of files that are currently being used, at regular time intervals. It can enabled or disabled.



Disk Defragmentation can be performed in several ways – Stealth (faster and usesd little memory), Space (Consolidates data, and further information is prevented), Complete/Name, Complete/Modified or Complete/Access (these three methods also reorganize file structure in alphabetical order or according to the last time when they were modified or accessed(.



Furthermore, it is possible to schedule a defragmentation (once or at a regular time interval) so it automatically performs.



O&O Defrag Professional Edition can also adapt itself to system load (thanks to the O&O Activity Guard), create a before and after reoport, use power management for notebooks, defrag when the screensaver is running, defrag multiple drives simultanously or individuals files and directories and more.



My tests were run on a heavily fragmented partition of 250 GB and O&O did a good job, but not extraordinary. Space could have been further optimized.



CPU and memory are either moderately or highly demanded (according to the type of defragmentation) when O&O is performing a task.



All-in All, O&O Defrag Professional Edition is a great piece of software for defragmentation purposes. It improves the boot time and the overall performance of your computer.


- Support for Windows 10 Preview
- ENGINE TRIM optimization of certain SSDs improved
- ENGINE various optimizations of Thin Provisioning Optimization
- ENGINE Checkdisk functionality did not work properly with Asian language edition of Windows 8.1 and Windows Server 2012 R2