c9429b30_yper_V_VS_Citrix_Xen___My_Blog__Hypervisor_Attributes
[VMware ESXi 5.0] 144 MB disk footprint (VMware vSphere Hypervisor) >3GB with Server Core installation ~10GB with full Windows Server installation [Citrix XenServer 5.6 FP1] >1GB [Hypervisor Attributes] 
Small Disk Footprint
Comparison between Vmware VS Hyper-V VS Citrix Xen | My Blog
Hypervisor Attributes