UltraDefrag Overview
UltraDefrag is a free, open-source disk defragmenter for Windows known for being fast and lightweight, and notable for its ability to defragment system files at boot time that cannot be moved while Windows is running (such as the page file and registry hives). It offers full-drive, single-file, and folder defragmentation, an optimization mode that consolidates free space, and both a graphical interface and a command-line/scripting option for automation. As with any defragmenter, it benefits traditional hard drives more than SSDs. It is a focused tool for users who want efficient fragmentation control. The download is the complete UltraDefrag setup, so it installs offline without pulling extra files. Because it is scriptable, administrators can automate defragmentation across many machines as a routine maintenance task. The official UltraDefrag download is linked on this page, straight from Ultradefrag Sourceforge.