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A notable example is in the context of platform virtualization, and a feature of certain virtualization software is the ability to access a hard disk at the raw level. Virtualization software may typically function via the usage of a virtual drive format like OVF, but some users may want the virtualization software to be able to run an operating system that has been installed on another disk or disk partition. In order to do this, the virtualization software must allow raw disk access to that disk or disk partition, and then allow that entire operating system to boot within the virtualization window.
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