I have seen instance when you copy large amount of data which takes several hours to complete throughput decreases . Initially it started more than 1000 MB per min and then finally its coming down to 300 or 400 MB per minute. I have seen this instance happening on all version of Windows expect windows 2008 R2 I would like to some suggesitons to keep the copy operation throughput. Please advise

Even this is worth looking at http://social.technet.microsoft.com/Forums/en/winserverfiles/thread/34b11569-1910-43ce-a6b2-fc73b4cf07f0-