INFORMATION" SCSI command:
https://bugzilla.redhat.com/show_bug.cgi?id=609049
As a result, `cdrom_id' doesn't print
ID_CDROM_MEDIA_TRACK_COUNT_DATA, which in turn prevents the
/dev/disk/by-label symlinks from being created. We need these in
the NixOS installation CD, so use ID_CDROM_MEDIA in the
corresponding udev rules for now. This was the behaviour in udev <=
154. See also
http://www.spinics.net/lists/hotplug/msg03935.html
svn path=/nixos/trunk/; revision=22691