| 1 | <?xml version="1.0" encoding="UTF-8"?>
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| 2 | <!DOCTYPE topic
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| 3 | PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 4 | <topic xml:lang="en-us" id="storage-cds">
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| 5 | <title>CD/DVD Support</title>
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| 6 |
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| 7 | <body>
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| 8 | <p>Virtual CD/DVD drives by default support only reading. The medium configuration is changeable at
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| 9 | runtime. You can select between the following options to provide the medium data: </p>
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| 10 | <ul>
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| 11 | <li>
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| 12 | <p><b outputclass="bold">Host Drive</b> defines that the guest can read from the medium in the host
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| 13 | drive. </p>
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| 14 | </li>
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| 15 | <li>
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| 16 | <p><b outputclass="bold">Image file</b> gives the guest read-only access to the data in the image.
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| 17 | This is typically an ISO file. </p>
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| 18 | </li>
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| 19 | <li>
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| 20 | <p><b outputclass="bold">Empty</b> means a drive without an inserted medium. </p>
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| 21 | </li>
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| 22 | </ul>
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| 23 | <p>Changing between the above, or changing a medium in the host drive that is accessed by a machine, or
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| 24 | changing an image file will signal a medium change to the guest OS. The guest OS can then react to the change, for
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| 25 | example by starting an installation program. </p>
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| 26 | <p>Medium changes can be prevented by the guest, and <ph conkeyref="vbox-conkeyref-phrases/product-name"
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| 27 | /> reflects that by locking the host drive if appropriate. You can force a medium removal in such situations by
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| 28 | using the VirtualBox Manager or the <userinput>VBoxManage</userinput> command line tool. Effectively this is the
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| 29 | equivalent of the emergency eject which many CD/DVD drives provide, with all associated side effects. The guest OS
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| 30 | can issue error messages, just like on real hardware, and guest applications may misbehave. Use this with caution. </p>
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| 31 | <note>
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| 32 | <p>The identification string of the drive provided to the guest, displayed by configuration tools such
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| 33 | as the Windows Device Manager, is always VBOX CD-ROM, irrespective of the current configuration of the virtual
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| 34 | drive. This is to prevent hardware detection from being triggered in the guest OS every time the configuration
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| 35 | is changed. </p>
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| 36 | </note>
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| 37 | <p>The standard CD/DVD emulation enables reading of standard data CD and DVD formats only. As an
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| 38 | experimental feature, for additional capabilities, it is possible to give the guest direct access to the CD/DVD
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| 39 | host drive by enabling <i>passthrough</i> mode. Depending on the host hardware, this may potentially enable the
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| 40 | following things to work: </p>
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| 41 | <ul>
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| 42 | <li>
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| 43 | <p>CD/DVD writing from within the guest, if the host DVD drive is a CD/DVD writer </p>
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| 44 | </li>
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| 45 | <li>
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| 46 | <p>Playing audio CDs </p>
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| 47 | </li>
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| 48 | <li>
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| 49 | <p>Playing encrypted DVDs </p>
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| 50 | </li>
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| 51 | </ul>
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| 52 | <p>To enable host drive passthrough you can use the <codeph>--passthrough</codeph> option of the
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| 53 | <userinput>VBoxManage storageattach</userinput> command. See <xref href="vboxmanage-storageattach.dita"/>. </p>
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| 54 | <p>Even if passthrough is enabled, unsafe commands, such as updating the drive firmware, will be blocked.
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| 55 | Video CD formats are never supported, not even in passthrough mode, and cannot be played from a virtual machine. </p>
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| 56 | <p>On Oracle Solaris hosts, passthrough requires running <ph
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| 57 | conkeyref="vbox-conkeyref-phrases/product-name"/> with real root permissions due to security measures enforced
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| 58 | by the host. </p>
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| 59 | </body>
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| 60 |
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| 61 | </topic>
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