[Bug 993728] Re: /dev/dvd disappears when a DVD is inserted

[Charles Lindsay]

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 at 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

Status in “udev” package in Ubuntu:
  Confirmed

Bug description:
  On a fresh boot, with no DVD inserted:

  $ ls -Al /dev/dvd
  lrwxrwxrwx 1 root root 3 May  2 18:25 /dev/dvd -> sr0

  As soon as I insert a DVD:

  $ ls -l /dev/dvd
  ls: cannot access /dev/dvd: No such file or directory

  The only new lines in dmesg are:

  [   88.411709] UDF-fs: Partition marked readonly; forcing readonly mount
  [   88.472834] UDF-fs: INFO Mounting volume 'WILLIAM_CASTLE_FILM_COLLECTION', timestamp 2009/08/19 19:32 (1e5c)

  This is on a fully updated install of Ubuntu 12.04, with udev
  175-0ubuntu9.

  I don't want /dev/dvd to stop existing exactly when I need to use it.

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