VirtualBox

Changeset 35174 in vbox


Ignore:
Timestamp:
Dec 16, 2010 12:30:08 PM (14 years ago)
Author:
vboxsync
Message:

Manual: updates, esp. storage settings rewrite

Location:
trunk/doc/manual/en_US
Files:
5 edited

Legend:

Unmodified
Added
Removed

  • trunk/doc/manual/en_US/user_BasicConcepts.xml

    r35065 r35174  
    353353            installed in the VM. This is the same setting that was specified
    354354            in the "New Virtual Machine" wizard, as described in <xref
    355             linkend="gui-createvm" />. </para>
     355            linkend="gui-createvm" />.</para>
    356356
    357357            <para>Whereas the default settings of a newly created VM depend on
    … …  
    750750    <title>Storage settings</title>
    751751
    752     <para>In the VM Settings window, the "Storage" section allows you to
    753     connect virtual hard disk, CD/DVD and floppy images and drives to your
    754     virtual machine:<mediaobject>
     752    <para>The "Storage" category in the VM settings allows you to connect
     753    virtual hard disk, CD/DVD and floppy images and drives to your virtual
     754    machine.</para>
     755
     756    <para>In a real PC, so-called "storage controllers" connect physical disk
     757    drives to the rest of the computer. Similarly, VirtualBox presents virtual
     758    storage controllers to a virtual machine. Under each controller, the
     759    virtual devices (hard disks, CD/DVD or floppy drives) attached to the
     760    controller are shown.<note>
     761        <para>This section can only give you a quick introduction to the
     762        VirtualBox storage settings. Since VirtualBox gives you an enormous
     763        wealth of options in this area, we have dedicated an entire chapter of
     764        this User Manual to explaining all the details: please see <xref
     765        linkend="storage" />.</para>
     766      </note></para>
     767
     768    <para>If you have used the "Create VM" wizard to create a machine, you
     769    will normally see something like the following:</para>
     770
     771    <para><mediaobject>
    755772        <imageobject>
    756773          <imagedata align="center" fileref="images/vm-settings-harddisk.png"
    … …  
    759776      </mediaobject></para>
    760777
    761     <para>In a real PC, so-called "storage controllers" connect physical disk
    762     drives to the rest of the computer. Similarly, VirtualBox presents virtual
    763     storage controllers to a virtual machine. Under each controller, the
    764     virtual devices (hard disks, CD/DVD or floppy drives) are shown that are
    765     attached to the controller.</para>
    766 
    767     <para>If you have used the "Create VM" wizard to create a machine, you
    768     will normally see the following devices:<itemizedlist>
    769         <listitem>
    770           <para>You will see an IDE controller, under which there are two
    771           devices:<itemizedlist>
    772               <listitem>
    773                 <para>one virtual hard disk connected to the IDE slot called
    774                 "primary master"; this is represented by the disk images that
    775                 you created with the machine;</para>
    776               </listitem>
    777 
    778               <listitem>
    779                 <para>one virtual CD/DVD drive connected to the "secondary
    780                 master".</para>
    781               </listitem>
    782             </itemizedlist></para>
    783         </listitem>
    784 
    785         <listitem>
    786           <para>In addition, there is a floppy controller to which a virtual
    787           floppy drive is attached.</para>
     778    <para>Depending on the guest operating system type that you selected when
     779    you created the VM, the typical layout of storage devices in a new VM is
     780    as follows:<itemizedlist>
     781        <listitem>
     782          <para>You will see an <emphasis role="bold">IDE
     783          controller,</emphasis> to which a virtual CD/DVD drive has been
     784          attached (to the "secondary master" port of the IDE
     785          controller).</para>
     786        </listitem>
     787
     788        <listitem>
     789          <para>You will also see a <emphasis role="bold">SATA
     790          controller,</emphasis> which is a more modern type of storage
     791          controller for higher hard disk data throughput, to which the
     792          virtual hard disks are attached. Initially you will normally have
     793          one such virtual disk, but as you can see in the above screenshot,
     794          you can have more than one, each represented by a disk image file
     795          (VDI files, in this case).</para>
    788796        </listitem>
    789797      </itemizedlist></para>
     798
     799    <para>If you created your VM with an older version of VirtualBox, the
     800    default storage layout may differ. You might then only have an IDE
     801    controller to which both the CD/DVD drive and the hard disks have been
     802    attached. This might also apply if you selected an older operating system
     803    type when you created the VM. Since older operating systems do not support
     804    SATA without additional drivers, VirtualBox will make sure that no such
     805    devices are present initially. Please see <xref
     806    linkend="harddiskcontrollers" /> for additional information.</para>
     807
     808    <para>VirtualBox also provides a <emphasis role="bold">floppy
     809    controller</emphasis>, which is special: you cannot add devices other than
     810    floppy drives to it. Virtual floppy drives, like virtual CD/DVD drives,
     811    can be connected to either a host floppy drive (if you have one) or a disk
     812    image, which in this case must be in RAW format.</para>
    790813
    791814    <para>You can modify these media attachments freely. For example, if you
    792815    wish to copy some files from another virtual disk that you created, you
    793     can connect that disk as a second hard disk. You could also add a second
    794     virtual CD/DVD drive, or change where these items are attached.</para>
    795 
    796     <para>In addition to the IDE controller, VirtualBox can also present a
    797     SATA controller and a SCSI controller to the guest, which gives you 30 or
    798     16 additional slots to attach devices to, respectively. This, however, may
    799     require that you run a modern guest operating system. See <xref
    800     linkend="harddiskcontrollers" /> for details.</para>
    801 
    802     <para>To <emphasis role="bold">add another virtual hard disk or CD/DVD
    803     drive,</emphasis> select the storage controller to which it should be
    804     added (IDE, SATA or SCSI) and then click on the "add disk" button below
    805     the tree. You can then either select "Add CD/DVD device" or "Add Hard
    806     Disk". Alternatively, right-click on the storage controller and select a
    807     menu item there.</para>
    808 
    809     <para>On the right part of the window, you can then select to which slot
    810     of the controller the virtual disk should be connected to and which image
    811     file to use.<itemizedlist>
    812         <listitem>
    813           <para>For virtual hard disks, a drop-down list appears on the right,
    814           listing all the hard disk images that VirtualBox currently knows
    815           about.</para>
    816 
    817           <para>The folder icon next to the drop-down allow you to select a
    818           different disk image using a standard file dialog.</para>
    819 
    820           <para>The second icon next to the drop-down allows you to create a
    821           new disk image; this will bring up the "Create new disk" wizard,
    822           which was described in <xref linkend="gui-createvm" />.</para>
    823         </listitem>
    824 
    825         <listitem>
    826           <para>For virtual CD/DVD drives, there are two kinds of options in
    827           the drop-down list.<itemizedlist>
     816    can connect that disk as a second hard disk, as in the above screenshot.
     817    You could also add a second virtual CD/DVD drive, or change where these
     818    items are attached. The following options are available:<itemizedlist>
     819        <listitem>
     820          <para>To <emphasis role="bold">add another virtual hard disk, or a
     821          CD/DVD or floppy drive,</emphasis> select the storage controller to
     822          which it should be added (IDE, SATA, SCSI, SAS, floppy controller)
     823          and then click on the "add disk" button below the tree. You can then
     824          either select "Add CD/DVD device" or "Add Hard Disk". (If you
     825          clicked on a floppy controller, you can add a floppy drive instead.)
     826          Alternatively, right-click on the storage controller and select a
     827          menu item there.</para>
     828
     829          <para>On the right part of the window, you can then set the
     830          following:<orderedlist>
    828831              <listitem>
    829                 <para>If you select "Empty", then VirtualBox will present a
    830                 virtual CD/DVD drive to the guest which has no media
    831                 inserted.</para>
     832                <para>You can then select to which <emphasis
     833                role="bold">device slot</emphasis> of the controller the
     834                virtual disk should be connected to. IDE controllers have four
     835                slots which have traditionally been called "primary master",
     836                "primary slave", "secondary master" and "secondary slave". By
     837                contrast, SATA and SCSI controllers offer you up to 30 slots
     838                to which virtual devices can be attached.</para>
    832839              </listitem>
    833840
    834841              <listitem>
    835                 <para>If you select "Host drive" from the list, then the
    836                 physical device of the host computer is connected to the VM,
    837                 so that the guest operating system can read from and write to
    838                 your physical device. This is, for instance, useful if you
    839                 want to install Windows from a real installation CD. In this
    840                 case, select your host drive from the drop-down list
    841                 presented.</para>
    842 
    843                 <para>If you want to write (burn) CDs or DVDs using the host
    844                 drive, you need to enable the <emphasis
    845                 role="bold">"Passthrough"</emphasis> option; see <xref
    846                 linkend="storage-cds" />.</para>
     842                <para>You can select which <emphasis role="bold">image
     843                file</emphasis> to use.<itemizedlist>
     844                    <listitem>
     845                      <para>For virtual hard disks, a button with a drop-down
     846                      list appears on the right, offering you to either select
     847                      a <emphasis role="bold">virtual hard disk
     848                      file</emphasis> using a standard file dialog or to
     849                      <emphasis role="bold">create a new hard disk</emphasis>
     850                      (image file), which will bring up the "Create new disk"
     851                      wizard, which was described in <xref
     852                      linkend="gui-createvm" />.</para>
     853
     854                      <para>For details on the image file types that are
     855                      supported, please see <xref
     856                      linkend="vdidetails" />.</para>
     857                    </listitem>
     858
     859                    <listitem>
     860                      <para>For virtual CD/DVD drives, the image files will
     861                      typically be in the standard ISO format instead. Most
     862                      commonly, you will select this option when installing an
     863                      operating system from an ISO file that you have obtained
     864                      from the Internet. For example, most Linux distributions
     865                      are available in this way.</para>
     866
     867                      <para>For virtual CD/DVD drives, the following
     868                      additional options are available:</para>
     869
     870                      <para><itemizedlist>
     871                          <listitem>
     872                            <para>If you select <emphasis role="bold">"Host
     873                            drive"</emphasis> from the list, then the physical
     874                            device of the host computer is connected to the VM,
     875                            so that the guest operating system can read from and
     876                            write to your physical device. This is, for
     877                            instance, useful if you want to install Windows from
     878                            a real installation CD. In this case, select your
     879                            host drive from the drop-down list presented.</para>
     880
     881                            <para>If you want to write (burn) CDs or DVDs using
     882                            the host drive, you need to also enable the
     883                            <emphasis role="bold">"Passthrough"</emphasis>
     884                            option; see <xref linkend="storage-cds" />.</para>
     885                          </listitem>
     886
     887                          <listitem>
     888                            <para>If you select <emphasis role="bold">"Remove
     889                            disk from virtual drive",</emphasis> VirtualBox will
     890                            present an empty CD/DVD drive to the guest into
     891                            which no media has been inserted.</para>
     892                          </listitem>
     893                        </itemizedlist></para>
     894                    </listitem>
     895                  </itemizedlist></para>
    847896              </listitem>
    848 
    849               <listitem>
    850                 <para>The other items in the list, like virtual hard disk
    851                 images, will be image files on your host. The file format here
    852                 is the ISO format. Most commonly, you will select this option
    853                 when installing an operating system from an ISO file that you
    854                 have obtained from the Internet. For example, most Linux
    855                 distributions are available in this way.</para>
    856               </listitem>
    857             </itemizedlist></para>
    858 
    859           <note>
    860             <para>The identification string of the drive provided to the guest
    861             (which, in the guest, would be displayed by configuration tools
    862             such as the Windows Device Manager) is always "VBOX CD-ROM",
    863             irrespective of the current configuration of the virtual drive.
    864             This is to prevent hardware detection from being triggered in the
    865             guest operating system every time the configuration is
    866             changed.</para>
    867           </note>
     897            </orderedlist></para>
     898        </listitem>
     899
     900        <listitem>
     901          <para>To <emphasis role="bold">remove an attachment,</emphasis>
     902          select it and click on the "remove" icon at the bottom (or
     903          right-click on it and select the menu item).</para>
    868904        </listitem>
    869905      </itemizedlist></para>
    870 
    871     <para>Note that the floppy controller is special: you cannot add devices
    872     other than floppy drives to it. Virtual floppy drives, like virtual CD/DVD
    873     drives, can be connected to either a host floppy drive (if you have one)
    874     or a disk image, which in this case must be in RAW format.</para>
    875 
    876     <para>To <emphasis role="bold">remove a virtual disk or drive,</emphasis>
    877     select it and click on the "remove" icon at the bottom (or right-click on
    878     it and select the menu item).</para>
    879906
    880907    <para>Removable media (CD/DVDs and floppies) can be changed while the
    … …  
    882909    time, you can also access these settings from the "Devices" menu of your
    883910    virtual machine window.</para>
    884 
    885     <para>We have dedicated an entire chapter of this User Manual to virtual
    886     storage: please see <xref linkend="storage" /> for every single detail
    887     about storage configuration.</para>
    888911  </sect1>
    889912
    … …  
    922945    outside world using the host's networking and the outside world can
    923946    connect to services on the guest which you choose to make visible outside
    924     of the virtual machine. In most cases, this default setup will work fine
    925     for you.</para>
    926 
    927     <para>However, VirtualBox is extremely flexible in how it can virtualize
    928     networking. It supports up to eight virtual network cards per virtual
    929     machine, the first four of which can be configured in detail in the
    930     graphical user interface. All eight network cards can be configured on the
    931     command line with VBoxManage. Because of this, we have dedicated an entire
    932     chapter of this manual to discussing networking configuration; please see
    933     <xref linkend="networkingdetails" />.</para>
     947    of the virtual machine.</para>
     948
     949    <para>This default setup is good for probably 95% of VirtualBox users.
     950    However, VirtualBox is extremely flexible in how it can virtualize
     951    networking. It supports many virtual network cards per virtual machine,
     952    the first four of which can be configured in detail in the Manager window.
     953    Additional network cards can be configured on the command line with
     954    VBoxManage. </para>
     955
     956    <para>Because of the vast array of options available, we have dedicated an
     957    entire chapter of this manual to discussing networking configuration;
     958    please see <xref linkend="networkingdetails" />.</para>
    934959  </sect1>
    935960
    … …  
    944969    <para>Ever since the original IBM PC, personal computers have been
    945970    equipped with one or two serial ports (also called COM ports by DOS and
    946     Windows). While these are no longer as important as they were until a few
    947     years ago (especially since mice are no longer connected to serial ports
    948     these days), there are still some important uses left for them. For
    949     example, serial ports can be used to set up a primitive network over a
    950     null-modem cable, in case Ethernet is not available. Also, serial ports
    951     are indispensable for system programmers needing to do kernel debugging,
    952     since kernel debugging software usually interacts with developers over a
    953     serial port. In other words, with virtual serial ports, system programmers
    954     can do kernel debugging on a virtual machine instead of needing a real
    955     computer to connect to.</para>
     971    Windows). Most importantly, computer mice used to be connected to serial
     972    ports before USB became commonplace. </para>
     973
     974    <para>While serial ports are no longer as important as they used to be,
     975    there are still some important uses left for them. For example, serial
     976    ports can be used to set up a primitive network over a null-modem cable,
     977    in case Ethernet is not available. Also, serial ports are indispensable
     978    for system programmers needing to do kernel debugging, since kernel
     979    debugging software usually interacts with developers over a serial port.
     980    With virtual serial ports, system programmers can do kernel debugging on a
     981    virtual machine instead of needing a real computer to connect to.</para>
    956982
    957983    <para>If a virtual serial port is enabled, the guest operating system sees
    958     it a standard 16450-type serial port. Both receiving and transmitting data
    959     is supported. How this virtual serial port is then connected to the host
    960     is configurable, and details depend on your host operating system.</para>
     984    a standard 16450-type device. Both receiving and transmitting data is
     985    supported. How this virtual serial port is then connected to the host is
     986    configurable, and the details depend on your host operating system.</para>
    961987
    962988    <para>You can use either the graphical user interface or the command-line
    … …  
    10051031              <listitem>
    10061032                <para>You can elect to have the virtual serial port
    1007                 "disconnected", which means that the guest will see it as
    1008                 hardware, but it will behave as if no cable had been connected
     1033                "disconnected", which means that the guest will see the
     1034                device, but it will behave as if no cable had been connected
    10091035                to it.</para>
    10101036              </listitem>
    … …  
    10141040                serial port on your host. (On a Windows host, this will be a
    10151041                name like <computeroutput>COM1</computeroutput>; on Linux or
    1016                 OpenSolaris hosts, it will be a device node like
     1042                Solaris hosts, it will be a device node like
    10171043                <computeroutput>/dev/ttyS0</computeroutput>). VirtualBox will
    10181044                then simply redirect all data received from and sent to the

  • trunk/doc/manual/en_US/user_Glossary.xml

    r35153 r35174  
    370370
    371371  <glossdiv>
     372    <title>T</title>
     373
     374    <glossentry>
     375      <glossterm>TAR</glossterm>
     376
     377      <glossdef>
     378        <para>A widely used file format for archiving. Originally, this stood
     379        for "Tape ARchive" and was already supported by very early Unix
     380        versions for backing up data on tape. The file format is still widely
     381        used today, for example, with OVF archives (with an
     382        <computeroutput>.ova</computeroutput> file extension); see <xref
     383        linkend="ovf" />.</para>
     384      </glossdef>
     385    </glossentry>
     386  </glossdiv>
     387
     388  <glossdiv>
    372389    <title>U</title>
    373390

  • trunk/doc/manual/en_US/user_GuestAdditions.xml

    r35141 r35174  
    12151215            guests. In particular:<itemizedlist>
    12161216                <listitem>
    1217                   <para>3D acceleration with Windows guests requires Windows 2000,
    1218                     Windows XP, Vista or Windows 7. Both OpenGL and Direct3D 8/9
    1219                     (not with Windows 2000) are supported (experimental).</para>
     1217                  <para>3D acceleration with Windows guests requires Windows
     1218                  2000, Windows XP, Vista or Windows 7. Both OpenGL and
     1219                  Direct3D 8/9 (not with Windows 2000) are supported
     1220                  (experimental).</para>
    12201221                </listitem>
    12211222
    12221223                <listitem>
    12231224                  <para>OpenGL on Linux requires kernel 2.6.27 and higher as
    1224                   well as X.org server version 1.5 and higher. Ubuntu 10.10 and
    1225                   Fedora 14 have been tested and confirmed as working.</para>
     1225                  well as X.org server version 1.5 and higher. Ubuntu 10.10
     1226                  and Fedora 14 have been tested and confirmed as
     1227                  working.</para>
    12261228                </listitem>
    12271229
    … …  
    13441346    <para><mediaobject>
    13451347        <imageobject>
    1346           <imagedata align="center" fileref="images/seamless.png" width="10cm" />
     1348          <imagedata align="center" fileref="images/seamless.png" width="14cm" />
    13471349        </imageobject>
    13481350      </mediaobject>To enable seamless mode, after starting the virtual
    … …  
    15031505    guest directories is available.</para>
    15041506
    1505     <para>To use these features, use the VirtualBox command line, see
    1506     <xref linkend="vboxmanage-guestcontrol" />.</para>
     1507    <para>To use these features, use the VirtualBox command line, see <xref
     1508    linkend="vboxmanage-guestcontrol" />.</para>
    15071509  </sect1>
    15081510

  • trunk/doc/manual/en_US/user_Introduction.xml

    r35090 r35174  
    2222  up to datacenter deployments and even Cloud environments.</para>
    2323
    24   <para>The following screenshot shows you how VirtualBox, installed on a
    25   Linux machine, is running Windows 7 in a virtual machine window:</para>
     24  <para>The following screenshot shows you how VirtualBox, installed on a Mac
     25  computer, is running Windows 7 in a virtual machine window:</para>
    2626
    2727  <para><mediaobject>
    2828      <imageobject>
    2929        <imagedata align="center" fileref="images/vm-vista-running.png"
    30                    width="10cm" />
     30                   width="14cm" />
    3131      </imageobject>
    3232    </mediaobject></para>
    … …  
    546546          To install an extension, simply double-click on the package file,
    547547          and the VirtualBox Manager will guide you through the required
    548           steps. </para>
     548          steps.</para>
    549549
    550550          <para>To view the extension packs that are currently installed,
    … …  
    595595                     width="10cm" />
    596596        </imageobject>
    597       </mediaobject>This is the VirtualBox Manager window. On the left, you
    598     can see a pane that will later list all your virtual machines. Since you
    599     have not created any, the list is empty. A row of buttons above it allows
    600     you to create new VMs and work on existing VMs, once you have some. The
    601     pane on the right displays the properties of the virtual machine currently
     597      </mediaobject>This window is called the <emphasis
     598    role="bold">"VirtualBox Manager".</emphasis> On the left, you can see a
     599    pane that will later list all your virtual machines. Since you have not
     600    created any, the list is empty. A row of buttons above it allows you to
     601    create new VMs and work on existing VMs, once you have some. The pane on
     602    the right displays the properties of the virtual machine currently
    602603    selected, if any. Again, since you don't have any machines yet, the pane
    603604    displays a welcome message.</para>
    … …  
    711712            </mediaobject></para>
    712713
    713           <para>In the wizard, you have the following options:</para>
     714          <para>Here you have the following options:</para>
    714715
    715716          <para><itemizedlist>
    … …  
    11321133          <imageobject>
    11331134            <imagedata align="center" fileref="images/vm-close.png"
    1134                        width="7cm" />
     1135                       width="11cm" />
    11351136          </imageobject>
    11361137        </mediaobject>The difference between these three options is crucial.
    … …  
    12521253                <imageobject>
    12531254                  <imagedata align="center" fileref="images/snapshots-1.png"
    1254                              width="10cm" />
     1255                             width="12cm" />
    12551256                </imageobject>
    12561257              </mediaobject></para>
    12571258
    1258             <para>VirtualBox allows you to take an unlimited number of
    1259             snapshots -- the only limitation is the size of your disks. Keep
    1260             in mind that each snapshot stores the state of the virtual machine
    1261             and thus needs some disk space; see the next section for
    1262             details.</para>
     1259            <para>VirtualBox imposes no limits on the number of snapshots you
     1260            can take. The only practical limitation is disk space on your
     1261            host: each snapshot stores the state of the virtual machine and
     1262            thus occupies some disk space. (See the next section for details
     1263            on what exactly is stored in a snapshot.)</para>
    12631264          </listitem>
    12641265
    … …  
    12681269            snapshots. By restoring a snapshot, you go back (or forward) in
    12691270            time: the current state of the machine is lost, and the machine is
    1270             restored to exactly the same state as it was when the snapshot was
     1271            restored to the exact state it was in when the snapshot was
    12711272            taken.<footnote>
    12721273                <para>Both the terminology and the functionality of restoring
    … …  
    13401341            the hard disk configuration or the VM's system settings, that
    13411342            change is undone when you restore the snapshot.)</para>
     1343
     1344            <para>The copy of the settings is stored in the machine
     1345            configuration, an XML text file, and thus occupies very little
     1346            space.</para>
    13421347          </listitem>
    13431348
    … …  
    13621367            less disk space. For the details, which can be complex, please see
    13631368            <xref linkend="diffimages" />.)</para>
     1369
     1370            <para>Creating the differencing image as such does not occupy much
     1371            space on the host disk initially, since the differencing image
     1372            will initially be empty (and grow dynamically later with each
     1373            write operation to the disk). The longer you use the machine after
     1374            having created the snapshot, however, the more the differencing
     1375            image will grow in size.</para>
    13641376          </listitem>
    13651377
    … …  
    13701382            VM window). When you restore such a snapshot, execution resumes at
    13711383            exactly the point when the snapshot was taken.</para>
     1384
     1385            <para>The memory state file can be as large as the memory size of
     1386            the virtual machine and will therefore occupy quite some disk
     1387            space as well.</para>
    13721388          </listitem>
    13731389        </itemizedlist></para>
    … …  
    14591475
    14601476        <listitem>
    1461           <para>Alternatively, the above files can be packed together into one
    1462           archive file, typically with an
    1463           <computeroutput>.ova</computeroutput> extension; such archive files
    1464           use a variant of the TAR archive format.</para>
     1477          <para>Alternatively, the above files can be packed together into a
     1478          single archive file, typically with an
     1479          <computeroutput>.ova</computeroutput> extension. (Such archive files
     1480          use a variant of the TAR archive format and can therefore be
     1481          unpacked outside of VirtualBox with any utility that can unpack
     1482          standard TAR files.)</para>
    14651483        </listitem>
    14661484      </orderedlist></para>
    … …  
    14821500        <imageobject>
    14831501          <imagedata align="center" fileref="images/ovf-import.png"
    1484                      width="10cm" />
     1502                     width="12cm" />
    14851503        </imageobject>
    14861504      </mediaobject>This presents the virtual machines described in the OVF

  • trunk/doc/manual/en_US/user_Storage.xml

    r35143 r35174  
    348348        <imageobject>
    349349          <imagedata align="center" fileref="images/virtual-disk-manager.png"
    350                      width="10cm" />
     350                     width="12cm" />
    351351        </imageobject>
    352352      </mediaobject>The known media are conveniently grouped in three tabs for
    … …  
    545545        <para>Technically, a "multiattach" image behaves identically to an
    546546        "immutable" image except the differencing image is not reset every
    547         time the machine starts. </para>
     547        time the machine starts.</para>
    548548      </listitem>
    549549
    … …  
    616616        <imageobject>
    617617          <imagedata align="center" fileref="images/virtual-disk-manager2.png"
    618                      width="10cm" />
     618                     width="12cm" />
    619619        </imageobject>
    620620      </mediaobject></para>
    … …  
    863863    eject which many CD/DVD drives provide, with all associated side effects:
    864864    the guest OS can issue error messages, just like on real hardware, and
    865     guest applications may misbehave. Use this with caution.</para>
     865    guest applications may misbehave. Use this with caution.<note>
     866        <para>The identification string of the drive provided to the guest
     867        (which, in the guest, would be displayed by configuration tools such
     868        as the Windows Device Manager) is always "VBOX CD-ROM", irrespective
     869        of the current configuration of the virtual drive. This is to prevent
     870        hardware detection from being triggered in the guest operating system
     871        every time the configuration is changed.</para>
     872      </note></para>
    866873
    867874    <para>The standard CD/DVD emulation allows for reading standard data CD
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