I'm not sure what type of your cdrw and cdrom. Some cdrw are treated as scsi eventhough they are ide.I considered your cdrw as cdrom1 and cdrom as cdrom2.
First you should remove the cdrom symlink in your mnt directory and create to folder:
1)cdrom1
2)cdrom2

Then edit your fstab...it should be like this:
# /etc/fstab: filesystem table.
#
# filesystem mountpoint type options dump pass
/dev/hda5 / ext3 defaults,errors=remount-ro 0 1

proc /proc proc defaults 0 0
/dev/fd0 /floppy vfat defaults,user,noauto,showexec,umask=022 0 0
usbdevfs /proc/bus/usb usbdevfs defaults 0 0
sysfs /sys sysfs defaults 0 0
/dev/dvd iso9660 defaults,ro,user,noexec,noauto 0 0
/dev/cdaudio /cdaudio iso9660 defaults,ro,user,noexec,noauto 0 0
[b]/dev/sr0 /cdrom1 iso9660 defaults,ro,user,noexec,auto 0 0
/dev/cdrom /cdrom2 iso9660 defaults,ro,user,noexec,auto 0 0
# Added by KNOPPIX
/dev/hda1 /mnt/hda1 ext3 noauto,users,exec 0 0
# Added by KNOPPIX
/dev/hda6 none swap defaults 0 0
# Added by KNOPPIX
/dev/hda7 /mnt/hda7 vfat noauto,users,exec,umask=000 0 0

Then create new device on your desktop, device that link to cdrom1 and device that link to cdrom2.
You can experiment with sr0 or cdrom.