I just added a DVD-RW to my system today. It was pretty easy. Just wanted to post a little info, in case anyone else has troubles.
First, a little info. I started out with one Hard drive and one optical drive (a generic dvd-rom). The hard drive is /dev/hda and the dvd-rom was /dev/hdc. I run the 220.127.116.11 kernel, but I keep all of my old kerenls available in LILO, so I also have a 2.6.7 kernel and a 2.4.26 kernel. I run Slackware 10, upgraded to -current via SWareT (using only packages from the official mirrors), and I run Dropline. I also use udev and hotplug. Some of this really doesn't matter, but I wanted to make sure everyone knows what I started with.
Before I started, I checked out /dev. I saw /dev/hdc, /dev/dvd, and /dev/cdrom. Both /dev/dvd and /dev/cdrom were symlinks pointing to /dev/hdc.
On with the installation. I unplugged everything from the computer and opened her up. I also unpacked the dvd-rw. In case anyone is wondering, I got a LITE-ON 8x DVD+/-R/+/-RW. It also says it's DVD+R Double Layer. I would give the model, but I haven't found it anywhere on the box.
After reading the manual, I decided what to do. I unplugged the IDE cable, the analog audio cable, and the power cable from the old dvd-rom. I removed it from it's bay. I changed the jumper settings and made it slave. I changed the jumper settings on the new dvd-rw to master. I put the New dvd-rw into the top bay and screwd it in. I put the old dvd-rom in the next bay and screwed it in. I connected the power to each of the drives. I connected the last connector on my IDE cable to the new dvd-rw and the connector in the middle of my IDE cable to the old dvd-rom. I connected the audio cable from new dvd-rw to the first audio input on my motherboard (I have onboard sound) and I connected the audio cable from the old dvd-rom to the second audio input on my motherboard. All done with the hardware side of things, I closed the box back up and plugged everything back in.
Now we get to the more intersting stuff. I reboot, choosing the 2.6.7 kernel. I went with that because CD burning is broken in the 18.104.22.168 kernel and the 2.4.26 kernel requires scsi emulation for CD burning. I note that my new dvd-rw is recognized during boot up as /dev/hdc and that my old dvd-rom is now /dev/hdd, which is to be expected with my master/slave settings. I check out my /dev directory and now have /dev/hdc, /dev/hdd, /dev/cdrom, and dev/dvd. /dev/cdrom and dev/dvd are symlinks to /dev/hdd. No problems there.
First thing I wnat to do is create a device called /dev/dvdrw, a symlink to /dev/hdc. Here's how I do that:
mv /etc/udev/rules.d/udev.rules /etc/udev/rules.d/50-udev.rules
Now I'm sitting in vi. I just enter the following line.
BUS="ide", KERNEL="hdc", NAME="%k", SYMLINK="dvdrw"
I save and exit. Almost there. I make myself a new mount point.
I already have a mount point /mnt/cdrom, so I'm all set there. Just gotta fix up /etc/fstab, and I should be home free. I edit it, and the important lines are now:
/dev/cdrom /mnt/cdrom iso9660 noauto,users,ro,nosuid 0 0
/dev/dvdrw /mnt/dvdrw iso9660 noauto,users,ro,nosuid 0 0
OK, that should take care of everything. For good measure, let's reboot. I reboot with the 2.6.7 kernel and start checking out my handy work. I head over to /dev and see /dev/hdc, /dev/hdd, /dev/cdrom, /dev/dvd, and /dev/dvdrw. /dev/cdrom and /dev/dvd are symlinks to /dev/hdd. /dev/dvdrw is a symlink to /dev/hdc. Perfect.
I decide to test out both optical drives with an audio cd. I put one in each drive and fire up gnome-cd. Right away, it picks up on the audio cd in the dvd-rom. That's what I expected, since the default setup for gnome-cd is to use device /dev/cdrom. Problem 1. I've got no sound. I open up gnome-volume-control and start looking things over. I had left the "Aux" line muted. I unmute that, and BOOM, I've got sound from my old dvd-rom. I change the device settings in gnome-cd to /dev/dvdrw. I had to restart gnome-cd. Didn't seem to like that change. Experimenting, I found that you can also hit the eject button in gnome cd after the chage to get the program to pick up on it. Anyways, the cd in /dev/dvdrw plays fine, as I had the volume set for the "CD" line all along. Looks like everything is peachy.
Now, to try burning something. I use k3b, which is on the Slackware installation CD under /extra. Even though I am in Gnome, it works great. I set up 76 minutes of music to burn, and 3:17 later, I've got a new CD that works perfectly.
I have a few issues which I am still ironing out. Let's go over those.
The first is permissions. Ihave noticed that with the current settings, /dev/hdc and /dev/dvdrw are set root:disk instead of root:cdrom. This is a small annoyance, as the users I have in the cdrom group are all in the disk group. Still would like to know how to change that. I'm thinking that all I need to do is change the line in /etc/udev/permissions.d/udev.permissions that looks like this:
Maybe using a naming trick like I did with udev.rules will also work. I'll try that out first and edit.
****** EDIT ******
I tried both methods. Neither worked. Any suggestions? Thanks.
The second is just a small annoyance, maybe specific to Gnome. When I open up "Computer", I see "CD-ROM" and "dvdrw". I wonder how cdrom got changed to "CD-ROM" while dvdrw didn't get changed to "DVD-RW"? Any ideas?
Well, I hope this khelps someone. Good luck,