Trying to make a decision on which type of disk to use in your Windows Server 2008 R2 Hyper-V deployment? Have a look at this independent performance study. The author set up his own lab and did a comparison of the performance of the three types of disk you could use in a production Hyper-V deployment. He concludes with saying that if you need the very most from the disk then go with a pass through disk. However, you lose very, very little by going with dynamic VHD’s.