Defrag.exe, the same name as the built-in command-line defragment utility in Windows XP and Windows Server 2003, is very small and very fast, with very little CPU and memory overhead. Especially useful for unattended servers in a lights-out computer hotel, but also great for desktop computers. Can be started by hand or automatically at regular times by the Task Scheduler. Very easy to use, there are no difficult options to learn, the utility will straight away defragment and optimize all your harddisks.