I can verify that Diskeeper has kept fragmentation in check across our Windows environment. We have been using Diskeeper in our environment for almost two years with good results.  We started with version 2010, and installed it on all of our Windows servers, both physical and virtual, server 2003 and 2008 R2 - over 800 machines in all. 

That first version of Diskeeper generated some impressive numbers across our environment – 33 million files defragmented, 947 million fragments prevented\eliminated (we were over 1 billion at one point there), and 21.6% performance increase on defragmented files. 

Not having to worry about the fragmentation on all of our many servers has saved us a lot of management headache.    

Christopher M. McIntyre, UK Healthcare

University of Kentucky, Lexington, KY