I see you're using slackware 10.2, which i believe uses the 2.4 series of kernels by default. If you type 'uname -r' in a terminal it will tell you your kernel version.
If it is a 2.4 kernel then you need the ide-scsi emulation to burn CDs and DVDs. Your CD drives will no longer be accessed as /dev/hdc and /dev/hdd but as /dev/sda and /dev/sdb for reading and /dev/sg0 and /dev/sg1 for writing. (Correct me if i'm wrong please!)
In the 2.6 kernels you don't need that any longer, you can use your burner through /dev/hdx (consider x a variable, should be /dev/hdd in your case).
This webpage should contain all the information you need, you definately won't need all of it but it is a good place to start. There are some good links to other how-tos at the bottom of the page as well. For sure have a look at the sections 'Getting Ready' and 'IDE and Linux Kernel Considerations' http://www.yolinux.com/TUTORIALS/Lin...ialCDBurn.html
Remember, google is your friend! Try www.google.com/linux