I have been using UltraDefrag for a few months now and I am very pleased with the results. It is easy to use, and it quickly and efficiently defrags locked files. The detailed reports are great for keeping track of progress and the sorting feature is really helpful. Overall, I would highly recommend UltraDefrag to anyone looking for a reliable and efficient defragmenter.
UltraDefrag 9.0.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the free program is UltraDefrag Development Team.
The program's installer files are generally known as dfrg.exe or ultradefrag.exe etc. We recommend checking the downloaded files with any free antivirus. The most popular versions among UltraDefrag users are 9.0, 7.1 and 7.0. UltraDefrag lies within System Utilities, more precisely HDD Management.
From the developer:
UltraDefrag is a disk defragmenter for Windows, which supports defragmentation of locked system files by running during the boot process. It is easy to use without any complicated scripting or a huge load of configuration settings. You can filter the files processed by size, number of fragments, file name and path. You can terminate the process early by specifying an execution time limit.
You may want to check out more software, such as DiskSurvey, PassMark Fragger or Home Server SMART, which might be related to UltraDefrag.