diskeeper is the biggest pile of trash ever coded. bloated, slow and inefficient. hell, u gotta run diskeeper like 10 times if your harddrive is a bit full. it's the most retarded defrag ever made. one time my HD was 80% full (**** movies) and diskeeper couldn't defrag it even after 12 tries (i gave up after 12). furthermore, if you want diskeeper to optimize file placement it can't do it just by pressing the button and having it defrag.....you gotta schedule it to run PerfectDisk did everything in one try. i'm with nuhi and all the other intelligent people in this thread: PerfectDisk is best by far. it's fast, small, doesn't use a lot of memory, and leaves your harddrive noticeably quicker.