A First Look at Microsoft Hyper-V RTM - VHD vs. VMDK
Now that Microsoft's Hyper-V has been released to manufacturing and will be ready for distribution via Microsoft Update starting July 8, the race to turn the hypervisor into a commodity has begun in earnest. eWEEK Labs will publish a full review of Hyper-V in the near future. Until then, here's a first look.
Microsoft uses a VHD (Virtual Hard Disk) format, while market leader VMware creates virtual hard drives using a VMDK, or Virtual Machine Disk, format. This screen shows a VHD being created in the newly released Hyper-V RTM.