4

With sudo lshw -C disk I get

  *-cdrom
       description: DVD-RAM writer
       product: DVDRAM GU71N
       vendor: HL-DT-ST
       physical id: 0.0.0
       bus info: scsi@1:0.0.0
       logical name: /dev/cdrom
       logical name: /dev/cdrw
       logical name: /dev/dvd
       logical name: /dev/dvdrw
       logical name: /dev/sr0
       version: 1.01
       capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
       configuration: ansiversion=5 status=ready
     *-medium
          physical id: 0
          logical name: /dev/cdrom

And with sudo mount /dev/sr0 /dev/dvd I get:

sudo mount /dev/sr0 /dev/dvd
mount: /dev/sr0 is write-protected, mounting read-only
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

And when I once hit the Esc key during startup - with the DVD in the tray - one of the boot messages read:

I/O buffer error in /dev/sr0 at sector 4096

Does anybody know what the problem is?

Update 1: I have done the stuff suggested in How to install all existing media codecs? - only two additional packages were needed. So my computer was already up to date in this regard.

But I now attempted sudo mount /dev/sr0 /dev/dvd again, followed by dmesg:

[  519.520092] sr 1:0:0:0: [sr0] FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  519.520102] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
[  519.520109] sr 1:0:0:0: [sr0] Add. Sense: Read of scrambled sector without authentication
[  519.520113] sr 1:0:0:0: [sr0] CDB: 
[  519.520116] Read(10): 28 00 00 00 04 00 00 00 02 00
[  519.520131] blk_update_request: I/O error, dev sr0, sector 4096
[  521.020285] sr 1:0:0:0: [sr0] FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  521.020297] sr 1:0:0:0: [sr0] Sense Key : Illegal Request [current]
[  521.020304] sr 1:0:0:0: [sr0] Add. Sense: Read of scrambled sector without authentication
[  521.020308] sr 1:0:0:0: [sr0] CDB: 
[  521.020311] Read(10): 28 00 00 00 04 01 00 00 01 00
[  521.020328] blk_update_request: I/O error, dev sr0, sector 4100
[  521.020335] Buffer I/O error on dev sr0, logical block 1025, async page read

I think "scrambled sector" refers to the CSS encryption that exists on DVDs - do I still need to install something?

Update 2: Using VLC and its "Open Disc..." dialog, now it works. And this:

sudo mount /dev/sr0 /dev/dvd
mount: /dev/sr0 is write-protected, mounting read-only
mount: mount point /dev/sr0 is not a directory
dmesg | tail
[ 1378.434161] UDF-fs: INFO Mounting volume 'PLATOON', timestamp 2000/09/24 06:26 (1000)

...but yet, the DVD doesn't appear anywhere. I can't navigate to the DVD.

  • Is this a standard install of Ubuntu? Have you added enhanced media handling and codecs? (If not, try: askubuntu.com/questions/171026/… ) – david6 Nov 6 '15 at 20:14
  • See my update above - only two packages needed to be downloaded. But it still does not work. – user258532 Nov 6 '15 at 20:36
  • Also check if you can read (music) CDs, and check whether the DVD is '+' or '-', etc. Basically, is the issue the same for any CD or DVD, or certain (copy protected) ones? Newer DVDs have 'updated' DRM and may still be unreadable on Ubuntu. Perhaps try the DVDs in a PS4 (or similar) or 'DVD player', to eliminate the disc as the problem. – david6 Nov 6 '15 at 22:21
  • Stupid me didn't check the DVD for errors. DVDs still do not get mounted, but I can play them using VLC or copy them with dvdbackup if they don't have bad sectors. – user258532 Nov 7 '15 at 23:27
  • What Ubuntu do you have, 15.10? – Mykhaylo Kopytonenko Jan 24 '16 at 20:56
0

This problem was caused by a defective DVD I borrowed (I usually don't have DVDs at home).

As of now, I'm using a clean install of Ubuntu 16.04, and I don't have problems with either CDs or DVDs. (I only have to remind myself to set up libdvd-pkg after a fresh install.)

Thank you for your comments!

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