From O&O Software:
Don't let a slow computer spoil your work or fun! Let O&O Defrag optimize your hard disks and you can experience speed increases of up to 100%. Regular disk defrag optimizes your PC performance.
PCs get slower in the course of their use. Two of the main reasons are the fragmentation of files and the storage of superfluous files. The new O&O Defrag 21 addresses these problems and ensures a significant speed increase and more comfortable work on the PC. A life expectancy for a PC of three to five years is no longer a rarity, especially since by Windows 10 many older PCs with a modern operating system can be used even longer. However, this also results in a significant loss of performance in the long run, since the continuous storage and deletion of files dramatically increases the fragmentation, resulting in noticeably longer access times during loading. The same applies to the temporary files created by many applications, which slow but surely "fill" the system and thus also reduce the speed during the daily work on the PC.
For this purpose, 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. In addition, O&O DiskStat 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.
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.
September 22, 2012
Version: O&O Defrag Professional Edition 15.8.801
New History section in version 16 comparing defrags before and after.
Version 16 is buggy.
Been using version 15. Installed and used version 16 awhile and it is buggy.
Version 15 used to automatically analyze disks when program started. Now in v16 you have to manually click Analyze button to analyze each disk, before and after a defrag.
When you run a Stealth defrag, after it finishes, it states, for example, 14% degree of fragmentation. But then after you click the Analyze button, after it finishes analyzing the disk, it states 85% degree.
Shutdown function after job completion no longer works.
External hard drives clusters appear in grey instead of colors (internal hard drives clusters appear correctly in colors)
Defragmentation speed is the same as v15 despite developer's claim of a 40% improvement.
Thank you for your feedback. We are very sorry that you have been experiencing problems.
The first point you raise is indeed the case now. We leave this option for the individual user to decide based on their personal preferences. The other issues you raise are not known issues, nor have we been able to replicate them here. We invite you therefore to contact our technical support team at firstname.lastname@example.org with full details of the issues and details of your operating system. They will then respond to you in detail.
Jim Harrison, Director of Sales International, O&O Software GmbH
July 21, 2012
Version: O&O Defrag Professional Edition 15.8.801
Windows 7 version sweet with perceived improvements in speed and effectiveness over Microsoft defrag.
Under Windows XP Professional (on PC and laptop)similar improvements not noticeable. On power down, both computers hang waiting for OODTRAY to finish and frequently power off is only achieved by forcing the program to finish, or sometimes holding the power off button in for 5 seconds. This is just unacceptable. Uninstalling is exceptionally difficult with neither the Control Panel nor the manufacturers Uninstall working, aftermarket uninstallers also do not remove it effectively. Manual removal seems to be the only way. Fatal flaw under XP.
June 10, 2012
Version: O&O Defrag Professional Edition 15.5.323
Easy to download in the first place!
Very slow in comparison to some other top quality progs. Not the best interface by any means. Cannot uninstall easily. Just a pain overall.
It is all to messy and difficult to sort out - even the uninstall side of things is made virtually impossible to achieve (and the only reason I say "virtually impossible" is that I intend to find a way, but obviously not with the help of O&O!)
O&O DiskStat 3 Full Program integrated. O&O DiskStat provides you with an overall view of just how your hard disk is 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. A further major function to speed up your systems.
Improved optimization of O&O DIskCleaner: 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.