Checking Drive Assignment

Linux recognizes CD and DVD drives upon booting if they are attached to your computer's motherboard with proper cabling and if they are assigned as either a master or slave on an IDE channel. Look through your kernel boot message for the drive device assignment, such as the following:

sr: DVDROM 10X, ATAPI CD/DVD-ROM drive

If you have a DVD-capable drive, you generally should also have a symbolic link named /dev/dvd and an entry under /media that point to your drive's device because many DVD clients, such as xine or vlc, look for /dev/dvd by default.

The first CD-RW drive is assigned to the device /dev/scd0 (although it might still be initially recognized while booting as an IDE device), with subsequent drives assigned to /dev/scd1, and so on. To initialize your drive for use, the following modules should be loaded:

Module Size Used by Not tainted sg 30244 0 (autoclean)

sr_mod 15192 0 (autoclean)

cdrom 27872 0 (autoclean) [sr_mod]

ide-scsi 8128 0

scsi_mod 96572 2 [sr_mod ide-scsi]

Look for kernel message output regarding the device such as this:

Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0 sr0: scsi3-mmc drive: 0x/32x writer cd/rw xa/form2 cdda tray Uniform CD-ROM driver Revision: 3.12

Your ATAPI-based CD-RW drive will then work as a SCSI device under emulation, and the symbolic link /dev/cdrom should point to /dev/scd0. You can also use the cdrecord command (included with Ubuntu's multimedia software packages) to acquire SCSI device information about your drive for later use during the burning operation, as follows:

# cdrecord -scanbus scsibus1:

1,0,0 0) 'HL-DT-ST' 'RW/DVD GCC-4120B' '2.01' Removable CD-ROM

The pertinent information—1,0,0 in the example (SCSI bus, device ID, and logical unit number, or LUN)—can then be used during a burn operation like this:

# cdrecord -v speed=8 dev=1,0,0 -data -eject file_name.img

In this example, a CD-ROM data image named file_name.img is created on a CD-R or CD-RW media at a speed of 8, and the new disk will be ejected after the write operation has completed.

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