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