Just another reassurance for anyone contemplating UD, I've been using it for the last few years and it has never caused any kind of corruption or problem.

Yes and one other item I forgot. I bought an earlier version which allowed me a download of the current update of UD. It is very good and there are some great fixes in there from the last version. It is also about 30% faster.Ultimate Defrag (UD)http://www.disktrix.com/store/cart.php?target=category&category_id=1http://www.disktrix.com/Can_Your_Defrag_Software_Do_This_2.htm?gclid=CIHKjurx4acCFUVqKgodjFfO9Q <- Tutorial is worth the read if you are new to defragging.O&O Sitehttp://www.oo-software.com/home/en/download/archive/index.html <- Here is where you can get the older version 12. They are on 14 right now.Take Care!