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When installing Win Server 2008 R2 (full, not core) with the purpose of adding Hyper-V, can you use the entire drive for the OS or do you have to leave some unused space on the disk for any VM's your going to add? 
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When installing Win Server 2008 R2 (full, not core) with the purpose of adding Hyper-V, can you use the entire drive for the OS or do you have to leave some unused space on the disk for any VM's your going to add? 

Installing Server 2008 R2 for use with hyper-v

Microsoft Virtual Server was a virtualization solution that facilitated the creation of virtual machines on the Windows XP, Windows Vista and Windows Server 2003 operating systems. Virtual machines are created and managed through a web-based interface that relies on Internet Information Services (IIS) or through a Windows client application tool called VMRCplus. Features included Linux guest operating system support, Virtual Disk Precompactor, symmetric multiprocessing (SMP), x64 host operating system support, the ability to mount virtual hard drives on the host machine and additional operating systems support, including Windows Vista, and a volume shadow copy writer.

Microsoft Virtual Server

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.