root@0[zip]# chgrp cdrom /dev/cdrom /dev/cdrom1
chgrp: cannot access `/dev/cdrom': No such file or directory
chgrp: cannot access `/dev/cdrom1': No such file or directory
root@0[zip]# cd ../..
root@0[/]# chgrp cdrom /dev/cdrom /dev/cdrom1
chgrp: cannot access `/dev/cdrom': No such file or directory
chgrp: cannot access `/dev/cdrom1': No such file or directory
root@0[/]# cd dev
root@0[dev]# sudo chgrp cdrom /dev/cdrom /dev/cdrom1
chgrp: cannot access `/dev/cdrom': No such file or directory
chgrp: cannot access `/dev/cdrom1': No such file or directory
root@0[dev]# cd /
root@0[/]# ll
total 144
drwxr-xr-x 2 root root 4096 Sep 3 06:20 bin
drwxr-xr-x 3 root root 4096 Sep 5 01:48 boot
drwxr-xr-x 2 root root 4096 Aug 6 02:16 cdaudio
drwxr-xr-x 2 root cdrom 4096 Sep 5 06:59 cdrom
drwxr-xr-x 2 root cdrom 4096 Sep 5 06:59 cdrom1
drwxr-xr-x 12 root root 36864 Sep 5 16:46 dev
drwxr-xr-x 2 root cdrom 4096 Sep 5 06:59 dvd
drwxr-xr-x 151 root root 8192 Sep 5 16:52 etc
drwxr-xr-x 2 root root 4096 Apr 14 2001 floppy
drwxrwsr-x 4 root staff 4096 Sep 3 05:29 home
drwxr-xr-x 2 root root 4096 Apr 14 2001 initrd
drwxr-xr-x 9 root root 8192 Sep 3 06:24 lib
drwx------ 2 root root 16384 Aug 6 02:05 lost+found
-rw------- 1 root root 6291 Aug 6 02:34 mbox
drwxr-xr-x 18 root root 4096 Sep 3 10:49 mnt
drwxr-xr-x 2 root root 4096 Apr 6 20:20 none
drwxr-xr-x 3 root root 4096 Apr 18 07:35 opt
dr-xr-xr-x 89 root root 0 Sep 5 12:45 proc
drwxr-xr-x 13 root root 4096 Sep 5 10:07 root
drwxr-xr-x 2 root root 8192 Sep 3 06:24 sbin
drwxr-xr-x 8 root root 0 Sep 5 12:45 sys
lrwxrwxrwx 1 root root 8 Aug 6 02:07 tmp -> /var/tmp
drwxr-xr-x 15 root root 4096 Feb 29 2004 usr
drwxr-xr-x 16 root root 4096 Jan 26 2004 var
lrwxrwxrwx 1 root root 13 Aug 6 02:17 vmlinuz -> /boot/vmlinuz
root@0[/]# ls -la /dev/cdrom*
ls: /dev/cdrom*: No such file or directory

I guess so. Now the cd writer does not work again. What happened after a reboot.