I still need help!! Re: Can't play DVD

Nils Kassube kassube at gmx.net
Wed Jun 3 19:31:15 UTC 2009

Knapp wrote:
> douglas at frog:~/Documents/MMORPG/Python/GroupSpaceAdventure/Client$ ls
> -l /dev/scd* /dev/dvd*
> lrwxrwxrwx  1 root root      4 2009-05-29 09:25 /dev/dvd1 -> scd0
> lrwxrwxrwx  1 root root      4 2009-05-29 09:25 /dev/dvdrw1 -> scd0
> brw-rw----+ 1 root cdrom 11, 0 2009-05-29 09:25 /dev/scd0

OK, like I expected - there is no /dev/dvd but only /dev/dvd1.

> I thought I would send a copy of cd.rules file also but oddly it is
> not there at all. It did not regenerate. ?? Why would that be?

Because you had a valid rules file:

> $ more /etc/udev/rules.d/70-persistent-cdBackupNew.rules

I'm not sure if the filename needs a ".rules" extension (the udev man 
page doesn't mention it) but your backup is located in the directory 
"/etc/udev/rules.d/" where udev looks for rules files and it does have 
the ".rules" extension. I would suggest you put your backup in another 
directory like e.g. "/etc/udev/backup/rules.d/".

> # This file was automatically generated by the
> /lib/udev/write_cd_rules # program, probably run by the
> cd-aliases-generator.rules rules file. #

I had a look at the script /lib/udev/write_cd_rules and if I understand 
the comment at the beginning correctly, it will only create the file 
"/etc/udev/rules.d/70-persistent-cd.rules" if there is no rule for the 
drive. Unfortunately your backup had the rules so there was no need to 
create the standard file.

So far I think it all looks consistent to me _but_ I have no explanation 
for the fact that you could play the dvd when it was in the drive at 


More information about the ubuntu-users mailing list