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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topic
PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="storage-cds">
<title>CD/DVD Support</title>
<body>
<p>Virtual CD/DVD drives by default support only reading. The medium configuration is changeable at
runtime. You can select between the following options to provide the medium data: </p>
<ul>
<li>
<p><b outputclass="bold">Host Drive</b> defines that the guest can read from the medium in the host
drive. </p>
</li>
<li>
<p><b outputclass="bold">Image file</b> gives the guest read-only access to the data in the image.
This is typically an ISO file. </p>
</li>
<li>
<p><b outputclass="bold">Empty</b> means a drive without an inserted medium. </p>
</li>
</ul>
<p>Changing between the above, or changing a medium in the host drive that is accessed by a machine, or
changing an image file will signal a medium change to the guest OS. The guest OS can then react to the change, for
example by starting an installation program. </p>
<p>Medium changes can be prevented by the guest, and <ph conkeyref="vbox-conkeyref-phrases/product-name"
/> reflects that by locking the host drive if appropriate. You can force a medium removal in such situations by
using the VirtualBox Manager or the <userinput>VBoxManage</userinput> command line tool. Effectively this is the
equivalent of the emergency eject which many CD/DVD drives provide, with all associated side effects. The guest OS
can issue error messages, just like on real hardware, and guest applications may misbehave. Use this with caution. </p>
<note>
<p>The identification string of the drive provided to the guest, displayed by configuration tools such
as the Windows Device Manager, is always VBOX CD-ROM, irrespective of the current configuration of the virtual
drive. This is to prevent hardware detection from being triggered in the guest OS every time the configuration
is changed. </p>
</note>
<p>The standard CD/DVD emulation enables reading of standard data CD and DVD formats only. As an
experimental feature, for additional capabilities, it is possible to give the guest direct access to the CD/DVD
host drive by enabling <i>passthrough</i> mode. Depending on the host hardware, this may potentially enable the
following things to work: </p>
<ul>
<li>
<p>CD/DVD writing from within the guest, if the host DVD drive is a CD/DVD writer </p>
</li>
<li>
<p>Playing audio CDs </p>
</li>
<li>
<p>Playing encrypted DVDs </p>
</li>
</ul>
<p>To enable host drive passthrough you can use the <codeph>--passthrough</codeph> option of the
<userinput>VBoxManage storageattach</userinput> command. See <xref href="vboxmanage-storageattach.dita"/>. </p>
<p>Even if passthrough is enabled, unsafe commands, such as updating the drive firmware, will be blocked.
Video CD formats are never supported, not even in passthrough mode, and cannot be played from a virtual machine. </p>
<p>On Oracle Solaris hosts, passthrough requires running <ph
conkeyref="vbox-conkeyref-phrases/product-name"/> with real root permissions due to security measures enforced
by the host. </p>
</body>
</topic>
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