bare metal
 n.— «Other products, such as Xen and VMware’s ESX Server, run in a hypervisor that sits beneath the guest operating systems and the hardware. Because the software layer sits on the “bare metal,” these are sometimes referred to as hardware VMs. Direct contact with the system hardware allows the VMs to work more efficiently.» —“Under the Hood: The Soul of a Virtual Machine” by Robert L. Mitchell Computerworld Apr. 25, 2005. (source: Double-Tongued Dictionary)

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