I am not arguing with this. Quite contrary, I am using DK on servers and recommending it to almost anyone as the best defrag for server. What I am saying though, is that I haven't seen any proof that it could show any measurable difference on the properly maintained home computer - that is, on which Windows built-in defrag is running at reasonable intervals. That is true, but in essence the main difference between server and workstation is more like difference between transport flow in the city, and one individual car. You can consider the first measurable, predictable in most ways. And it is done so when creating transport flow control systems. While, other-single car, may be predictable too in minds of creators of, for example, automatic intelligent gearboxes, but in fact is not. This is a mistake that serious car manufacturers have done(like even BMW), and defrag software vendors are doing too. The computer in test was not used for web browsing. Instead, it was intensively used whole week for preparing a project - that is why 10hours/day. The most used programs were Bentley micro station, then Visio for preparing diagrams, Acrobat for creating pdf's. The only thing - files were stored on data partition and ready files transferred to server. And, as using Micro Station was kinda unusual, I have specially tested Autocad startup times instead, as it is in general much more important application, along with Photoshop. That is a real life situation, you know, not some kind of artificial test drive. <br /> Exactly, but as I said already, there is no way average user could really test it. Instead, user may(and does) feel better, because this is a general mood(created by vendors) out there. Similar as so many are buying different cleaners that simply find *.bak files, or registry tools that do very primitive job, but makes people happy. Probably not, or maybe yes, but at least Mark Russinovich has created something like contig, which if paired with power defrag, is FREE and quite adequate for every home user needs. Unfortunately, I haven't seen any vendor advertising similar free solutions. I see server exactly as a dividing line. Completely different concept, and different approach needed. Thank you for that. I hope you will help to understand how your product is $100 better than properly used Windows built-in defrag, combined with good general computer practices, then.