Hello!
I was reading the Best Practice manual on how to back up Hyper-V VMs. As it say in the manual, it's recommended to creat 3 partitions, one for system, one for more static VMs, and one for more dynamic VMs.
Hyper-V Best Prectice: http://www.storagecraft.eu/fileadmin/Website.eu/Documents/EN/Support_and_Downloads/Best_Practices/Microsoft%20Hyper-V-EN.pdf