Buzzsaw On-The-Fly Defragmenter

Product: Buzzsaw On-The-Fly Defragmenter 2.1.2
Company: Mind Array Technology   
Website: http://www.dirms.com/
Type: Free
Requirements: Windows NT/2000/XP 

Buzzsaw.exe defrags files while you work, keeping your drive undefragmented in the background. Dirms.exe is a command-line defragmenter that will even partially defrag large files when instructed to do so.