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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="ts_linux-host-ide-messages">
<title>Strange Guest IDE Error Messages When Writing to CD or DVD</title>
<body>
<p>
If the experimental CD or DVD writer support is enabled with an
incorrect host or guest configuration, it is possible that any
attempt to access the CD or DVD writer fails and simply results
in guest kernel error messages for Linux guests or application
error messages for Windows guests. <ph conkeyref="vbox-conkeyref-phrases/product-name"/> performs the
usual consistency checks when a VM is powered up. In particular,
it aborts with an error message if the device for the CD or DVD
writer is not writable by the user starting the VM. But
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> cannot detect all misconfigurations. The
necessary host and guest OS configuration is not specific for
<ph conkeyref="vbox-conkeyref-phrases/product-name"/>, but a few frequent problems are listed here
which occurred in connection with <ph conkeyref="vbox-conkeyref-phrases/product-name"/>.
</p>
<p>
Special care must be taken to use the correct device. The
configured host CD or DVD device file name, in most cases
<filepath>/dev/cdrom</filepath>, must point to the device that
allows writing to the CD or DVD unit. For CD or DVD writer units
connected to a SCSI controller or to a IDE controller that
interfaces to the Linux SCSI subsystem, common for some SATA
controllers, this must refer to the SCSI device node, such as
<filepath>/dev/scd0</filepath>. Even for IDE CD or DVD writer
units this must refer to the appropriate SCSI CD-ROM device
node, such as <filepath>/dev/scd0</filepath>, if the
<userinput>ide-scsi</userinput> kernel module is loaded. This module
is required for CD or DVD writer support with some early 2.6
kernels. Many Linux distributions load this module whenever a CD
or DVD writer is detected in the system, even if the kernel
would support CD or DVD writers without the module.
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> supports the use of IDE device files, such as
<filepath>/dev/hdc</filepath>, provided the kernel supports this
and the <userinput>ide-scsi</userinput> module is not loaded.
</p>
<p>
Similar rules, except that within the guest the CD or DVD writer
is always an IDE device, apply to the guest configuration. Since
this setup is very common, it is likely that the default
configuration of the guest works as expected.
</p>
</body>
</topic>
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