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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →A hardware virtual machine (VM) is a software-defined computer that presents virtual hardware to a guest operating system. A hypervisor creates and manages the VM, mapping its virtual processors, memory, storage and network interfaces to resources on a physical computer called the host.
What does “hardware virtual machine” mean?
The term usually refers to a system virtual machine: an environment that can run an operating system as though it had its own computer. The guest operating system uses the virtual hardware presented to it, while the physical resources ultimately come from the host.
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IBM describes a virtual machine as a software-based representation or emulation of a physical computer. Its account of VM/370 says IBM rolled it out on 2 August 1972, describing it as what many regard as the first virtual machine; that is IBM’s qualified historical characterization, not a claim that virtual-machine ideas began on that date. IBM’s virtual machine overview
How is a hardware VM different from a process VM?
A system VM provides a machine environment capable of running a guest operating system. A process VM, by contrast, supports an application or process within an existing operating system. The Java virtual machine (JVM) is a common example of the latter; it is not a whole virtual computer running a guest OS. IBM’s overview explains both categories
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What do the host, guest and hypervisor do?
- Host: the physical computer whose processor, memory, storage and networking supply the VM’s resources.
- Guest: the operating system running inside the VM.
- Hypervisor: the software layer, also called a virtual machine monitor, that creates and manages VMs and coordinates their access to host resources.
Several guest operating systems can run on one host under hypervisor management. The VM is the virtual computer and guest environment; the hypervisor is the layer managing it. IBM’s hypervisor overview
How does a hypervisor provide virtual hardware?
The hypervisor exposes virtual resources—such as processors, memory, virtual disks and network interfaces—to a VM, then coordinates them with the underlying hardware. For example, Microsoft documents virtual processors and memory, virtual hard disks and virtual switches as Hyper-V concepts. The particular device model and available features depend on the hypervisor and VM configuration; a VM does not necessarily emulate every physical component in the same way. Microsoft’s Hyper-V technology overview and Microsoft’s Hyper-V terminology and planning documentation
Analogy: Think of separate apartments in one building. Each guest has a defined environment, while the building is shared physical infrastructure and the hypervisor manages allocation and separation. The analogy has limits: a VM is not physically independent of its host.
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What is the difference between type 1 and type 2 hypervisors?
The labels describe where the hypervisor runs, not whether the guest is a “real” VM.
| Type | Where it runs | Examples and context |
|---|---|---|
| Type 1 (bare-metal or native) | Directly on the physical hardware | IBM names VMware ESXi as an example; Microsoft classifies Hyper-V as type 1. Often associated with server virtualization. |
| Type 2 (hosted) | As an application within a host operating system | IBM names Oracle VM VirtualBox as an example and notes hosted virtualization can suit individual PC use. |
These classifications describe architecture; they do not establish that type 1 is always faster or safer. Performance and isolation depend on the implementation, configuration, workload and hardware. IBM’s hypervisor overview; Microsoft’s Hyper-V overview
Quick Recap
What a hardware VM is—and is not
- It is a software-defined machine environment that can run a guest operating system using virtualized hardware.
- It is not a separate physical computer: its resources come from a host.
- It is not the same as a process VM such as the JVM.
- Its virtual devices and capabilities depend on the hypervisor and configuration.
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