I've got a confusing situation with two cd devices. It started after I did this
enabled grub
rearranged fstab
compiled & installed kernel 2.6.4

I tried to burn an ISO/dao with Xcdroast, cdrecord cannot detect scsi device, but it was showing the devices(atapi). K3B starts with an error about cdrdao and scsi emulation. I've read and read about this & tried a number of different configurations, from the kernel to fstab, to grub menu.lst. As of now, I cannot read or write with either drive with any application. I give up altering this mess and submit for help here. These are the configs;

fstab:
# filesystem mountpoint type options dump pass
/dev/hda1 / reiserfs defaults 0 1
/dev/hda2 none swap sw 0 0
proc /proc proc defaults 0 0
/dev/fd0 /floppy auto defaults,user,noauto,showexec,umask=022 0 0
/dev/hdc /cdrom iso9660 noauto,user,ro 0 0
/dev/hdd /cdrom1 iso9660 noauto,user,ro 0 0

grub:
title GNU/Linux
password --md5 .....
root (hd0,0)
kernel /boot/vmlinuz-2.6.4 ro root=/dev/hda1 hdc=ide-scsi hdd=ide-scsi
initrd /boot/initrd.gz

modules.conf: Question, where -exactly- does this option go, if necessary?
options ide-cd ignore='hdc hdd'
pre-install sg modprobe ide-scsi
I don't have any ### start lines concerning scsi ide that I've found in this file.

kernel:
IDE/ATAPI CDROM=M
IDE/SCSI emulation=M
SCSI support=M

I'm just beginning to understand Linux, so if I've left something crucial out, please le me know.

I am not sure if I am on the right track, but as far as I know, there is no need of scsi-emulation with the 2.6 kernels. I recently upgraded and had to change the symbolic links of /dev/cdrom, /dev/cdrecorder and /dev/dvd from /dev/sr0 to /dev/hdc (as root, deleting old links, creating new). Since then, everything works fine.

These are my /etc/fstab entries:

/dev/cdrecorder /media/cdrecorder auto ro,noauto,user,exec 0 0
/dev/cdrom /media/cdrom auto ro,noauto,user,exec 0 0
/dev/dvd /media/dvd auto ro,noauto,user,exec 0 0

Markus

Yep, no working SCSI emulation in 2.6.x so just re-do your old sylinks as abouve, and make sure you have the latest versions of cdrdao and cdrtools on your system. k3b still say to me that it won't work, but I've turned off that message, and it works like a charm now....! Enjoy.