Interestingly, my 70-persistent-cd.rules exists, it's just effectively
empty:
$ cat /etc/udev/rules.d/70-persistent-cd.rules
# This file maintains persistent names for CD/DVD reader and writer devices.
# See udev(7) for syntax.
#
# Entries are automatically added by the 75-cd-aliases-generator.rules
# file; however you are also free to add your own entries provided you
# add the ENV{GENERATED}=1 flag to your own rules as well.
I wonder if Ubuntu didn't properly detect something when it was
installing itself? For reference, here's the pertinent output of some
of the commands you mention, from my machine:
$ sudo lshw -C disk
...
*-cdrom
description: DVD-RAM writer
product: BD-RE WH10LS30
vendor: HL-DT-ST
physical id: 0.0.0
bus info: scsi@3:0.0.0
logical name: /dev/sr0
version: 1.00
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=nodisc
$ ls /dev/disk/by-path/
... pci-0000:00:11.0-scsi-3:0:0:0
$ ls -Al /dev/disk/by-id/
...
lrwxrwxrwx 1 root root 9 Jul 9 23:38 ata-HL-DT-ST_BD-RE_WH10LS30_K97A3NA2854
-> ../../sr0
Does any of that matter? I doubt it. I'd have to check specifically,
but I'm fairly certain I get the same problem on all other machines I
use.
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https://bugs.launchpad.net/bugs/993728
Title:
/dev/dvd disappears when a DVD is inserted
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