[mythtv-users] ATSC Unwatchable

Joseph Fry joe at thefrys.com
Wed Sep 12 02:28:29 UTC 2012

> Second... Xen works differently than VMware or  Virtualbox... both of
> those operate ON TOP of an OS.... hypervisors like Xen and HyperV operate
> below the OS... the DOM0 OS is only there to manage the hypervisor, it's
> actually virtualized itself.

For clearification see:


Robert P. Goldberg classifies two types of

   - *Type 1* (or *native*, bare
   hypervisors run directly on the host's hardware to control the hardware and
   to manage guest operating systems. A guest operating system thus runs on
   another level above the hypervisor.

This model represents the classic implementation of virtual machine
architectures; the original hypervisors were the test tool,
and CP/CMS <http://en.wikipedia.org/wiki/CP/CMS>, both developed at
IBM<http://en.wikipedia.org/wiki/IBM> in
the 1960s. CP/CMS was the ancestor of IBM's
Modern equivalents of this are Oracle VM Server for
the Citrix XenServer <http://en.wikipedia.org/wiki/Xen>,
, VMware ESX <http://en.wikipedia.org/wiki/VMware_ESX>/ESXi, and Microsoft
Hyper-V <http://en.wikipedia.org/wiki/Hyper-V> hypervisor.

   - *Type 2* (or *hosted*) hypervisors run within a conventional operating
   system <http://en.wikipedia.org/wiki/Operating_system> environment. With
   the hypervisor layer as a distinct second software level, guest operating
   systems run at the third level above the hardware.
   , VMware Workstation <http://en.wikipedia.org/wiki/VMware_Workstation>
    and VirtualBox <http://en.wikipedia.org/wiki/VirtualBox> are examples
   of Type 2 hypervisors.


Xen is an open-source type-1 or baremetal
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