I don't think you should be using the built-in windows defrag utility. It is firsot of all not that good at defragging, doesn't have any file placement, meaning doesn't place files in the area where disk has optimal performance. It also doesn't deep defrag. And doesn't delete temporary files. And it also lacks many other features and doesn't prevent fragments that much either.
So get one of these utilities: MyDefrag (formerly known as JkDefrag)
Both of these are free and the best defragmenters. Though I recommend SmartDefrag because in tests, it has been to give optimal performance even when compared to commercial defragmenters. It also has deep defrag, optimal disk performance by file placement, automated defrag, defrag multivolumes. It also prevents more fragments than any other defragmenter. For the defragmenter comparison, click here: http://www.iobit.com/Images/isdcompare.gif
Edited by genius12, 31 July 2009 - 01:16 AM.