| 1 | <?xml version='1.0' encoding='UTF-8'?>
|
|---|
| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
|
|---|
| 3 | <topic xml:lang="en-us" id="ts_linux-host-ide-messages">
|
|---|
| 4 | <title>Strange Guest IDE Error Messages When Writing to CD or DVD</title>
|
|---|
| 5 |
|
|---|
| 6 | <body>
|
|---|
| 7 | <p>
|
|---|
| 8 | If the experimental CD or DVD writer support is enabled with an
|
|---|
| 9 | incorrect host or guest configuration, it is possible that any
|
|---|
| 10 | attempt to access the CD or DVD writer fails and simply results
|
|---|
| 11 | in guest kernel error messages for Linux guests or application
|
|---|
| 12 | error messages for Windows guests. Oracle VM VirtualBox performs the
|
|---|
| 13 | usual consistency checks when a VM is powered up. In particular,
|
|---|
| 14 | it aborts with an error message if the device for the CD or DVD
|
|---|
| 15 | writer is not writable by the user starting the VM. But
|
|---|
| 16 | Oracle VM VirtualBox cannot detect all misconfigurations. The
|
|---|
| 17 | necessary host and guest OS configuration is not specific for
|
|---|
| 18 | Oracle VM VirtualBox, but a few frequent problems are listed here
|
|---|
| 19 | which occurred in connection with Oracle VM VirtualBox.
|
|---|
| 20 | </p>
|
|---|
| 21 | <p>
|
|---|
| 22 | Special care must be taken to use the correct device. The
|
|---|
| 23 | configured host CD or DVD device file name, in most cases
|
|---|
| 24 | <filepath>/dev/cdrom</filepath>, must point to the device that
|
|---|
| 25 | allows writing to the CD or DVD unit. For CD or DVD writer units
|
|---|
| 26 | connected to a SCSI controller or to a IDE controller that
|
|---|
| 27 | interfaces to the Linux SCSI subsystem, common for some SATA
|
|---|
| 28 | controllers, this must refer to the SCSI device node, such as
|
|---|
| 29 | <filepath>/dev/scd0</filepath>. Even for IDE CD or DVD writer
|
|---|
| 30 | units this must refer to the appropriate SCSI CD-ROM device
|
|---|
| 31 | node, such as <filepath>/dev/scd0</filepath>, if the
|
|---|
| 32 | <userinput>ide-scsi</userinput> kernel module is loaded. This module
|
|---|
| 33 | is required for CD or DVD writer support with some early 2.6
|
|---|
| 34 | kernels. Many Linux distributions load this module whenever a CD
|
|---|
| 35 | or DVD writer is detected in the system, even if the kernel
|
|---|
| 36 | would support CD or DVD writers without the module.
|
|---|
| 37 | Oracle VM VirtualBox supports the use of IDE device files, such as
|
|---|
| 38 | <filepath>/dev/hdc</filepath>, provided the kernel supports this
|
|---|
| 39 | and the <userinput>ide-scsi</userinput> module is not loaded.
|
|---|
| 40 | </p>
|
|---|
| 41 | <p>
|
|---|
| 42 | Similar rules, except that within the guest the CD or DVD writer
|
|---|
| 43 | is always an IDE device, apply to the guest configuration. Since
|
|---|
| 44 | this setup is very common, it is likely that the default
|
|---|
| 45 | configuration of the guest works as expected.
|
|---|
| 46 | </p>
|
|---|
| 47 | </body>
|
|---|
| 48 |
|
|---|
| 49 | </topic>
|
|---|
