O&O Defrag Professional Edition is a powerful tool used for defragmenting partitions, thus optimizing your computer's performance.
The user interface is easy to follow. It has a ribbon bar that displays all possible actions made in O&O, a list of available local drives, and a few tabs: cluster view, history of fragmentation, drive status, jobs, reports, and file status.
The cluster view displays the amount of clusters arranged graphically as a block. The blocks are shown in prioritized 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 be either enabled or disabled.
Disk defragmentation can be done in several ways - Stealth (faster and uses little memory), Space (consolidates data, and further fragmentation 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 adapts itself to system load (thanks to the O&O Activity Guard), create a before and after report, use power management for notebooks, defrag when the screensaver is running, defrag multiple drives simultaneously or individual files and directories, and more.
Our tests were run on a heavily fragmented partition of 250GB, and O&O did a good job, but not extraordinary. Space could have been further optimized.
CPU and memory are either moderately or highly demmanded (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, and it has a lot of useful feature. Additionally, the price for the full professional version is quite cheap.