| 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>
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| 9 | Virtual CD/DVD drives by default support only reading. The medium
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| 10 | configuration is changeable at runtime. You can select between the
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| 11 | following options to provide the medium data:
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| 12 | </p>
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| 13 | <ul>
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| 14 | <li>
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| 15 | <p>
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| 16 | <b outputclass="bold">Host Drive</b> defines that the
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| 17 | guest can read from the medium in the host drive.
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| 18 | </p>
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| 19 | </li>
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| 20 | <li>
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| 21 | <p>
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| 22 | <b outputclass="bold">Image file</b> gives the guest
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| 23 | read-only access to the data in the image. This is typically
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| 24 | an ISO file.
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| 25 | </p>
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| 26 | </li>
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| 27 | <li>
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| 28 | <p>
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| 29 | <b outputclass="bold">Empty</b> means a drive without
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| 30 | an inserted medium.
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| 31 | </p>
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| 32 | </li>
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| 33 | </ul>
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| 34 | <p>
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| 35 | Changing between the above, or changing a medium in the host drive
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| 36 | that is accessed by a machine, or changing an image file will
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| 37 | signal a medium change to the guest OS. The guest OS can then
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| 38 | react to the change, for example by starting an installation
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| 39 | program.
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| 40 | </p>
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| 41 | <p>
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| 42 | Medium changes can be prevented by the guest, and Oracle VM VirtualBox
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| 43 | reflects that by locking the host drive if appropriate. You can
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| 44 | force a medium removal in such situations by using the VirtualBox
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| 45 | Manager or the <userinput>VBoxManage</userinput> command line tool.
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| 46 | Effectively this is the equivalent of the emergency eject which
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| 47 | many CD/DVD drives provide, with all associated side effects. The
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| 48 | guest OS can issue error messages, just like on real hardware, and
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| 49 | guest applications may misbehave. Use this with caution.
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| 50 | </p>
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| 51 | <note>
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| 52 | <p>
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| 53 | The identification string of the drive provided to the guest,
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| 54 | displayed by configuration tools such as the Windows Device
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| 55 | Manager, is always VBOX CD-ROM, irrespective of the current
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| 56 | configuration of the virtual drive. This is to prevent hardware
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| 57 | detection from being triggered in the guest OS every time the
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| 58 | configuration is changed.
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| 59 | </p>
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| 60 | </note>
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| 61 | <p>
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| 62 | The standard CD/DVD emulation enables reading of standard data CD
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| 63 | and DVD formats only. As an experimental feature, for additional
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| 64 | capabilities, it is possible to give the guest direct access to
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| 65 | the CD/DVD host drive by enabling <i>passthrough</i>
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| 66 | mode. Depending on the host hardware, this may potentially enable
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| 67 | the following things to work:
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| 68 | </p>
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| 69 | <ul>
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| 70 | <li>
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| 71 | <p>
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| 72 | CD/DVD writing from within the guest, if the host DVD drive is
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| 73 | a CD/DVD writer
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| 74 | </p>
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| 75 | </li>
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| 76 | <li>
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| 77 | <p>
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| 78 | Playing audio CDs
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| 79 | </p>
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| 80 | </li>
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| 81 | <li>
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| 82 | <p>
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| 83 | Playing encrypted DVDs
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| 84 | </p>
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| 85 | </li>
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| 86 | </ul>
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| 87 | <p>
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| 88 | To enable host drive passthrough you can use the
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| 89 | <codeph>--passthrough</codeph> option of the <userinput>VBoxManage
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| 90 | storageattach</userinput> command. See
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| 91 | <xref href="man_VBoxManage-storageattach.dita#vboxmanage-storageattach"/>.
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| 92 | </p>
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| 93 | <p>
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| 94 | Even if passthrough is enabled, unsafe commands, such as updating
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| 95 | the drive firmware, will be blocked. Video CD formats are never
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| 96 | supported, not even in passthrough mode, and cannot be played from
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| 97 | a virtual machine.
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| 98 | </p>
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| 99 | <p>
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| 100 | On Oracle Solaris hosts, passthrough requires running
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| 101 | Oracle VM VirtualBox with real root permissions due to security measures
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| 102 | enforced by the host.
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| 103 | </p>
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| 104 | </body>
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| 105 |
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| 106 | </topic>
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