Definition

host operating system

A host operating system (OS) is the original OS installed on a computer. Other operating systems are sometimes installed on a computer, in addition to the host OS, as guest operating systems. For the purposes of disk partitioning, a guest OS must be the same as the host OS. In virtualization, however, a guest OS can be a different from the host.

This was last updated in November 2007
Posted by: Margaret Rouse

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