Diskeeper: Claimed to be "the most intelligent real-time defragmentation tool in history"

No matter how good your computer is, it will definitely generate disk fragmentation, and disk fragmentation can cause the system to perform less efficiently, which means that access to web pages, files, and programs will slow down. Diskeeper can automatically eliminate disk fragmentation and keep your computer running at its best! It completely replaces the disk defragmentation tool built into Windows.