Hyper-V and VHD Performance - Dynamic vs. Fixed
If you are in the midst of testing and deploying Virtual machines using the VHD file format on Hyper-V and want the best performance from a I/O performance check out this post by Tim Litton http://blogs.technet.com/winserverperformance/archive/2008/09/19/hyper-v-and-vhd-performance-dynamic-vs-fixed.aspx
