*** This bug is a duplicate of bug 16722 ***
    https://bugs.launchpad.net/bugs/16722

Hmm. Resurrecting this bug, sorry ;)

CD Reading OK, can't verify CD writing (no CD-Rs or CD-RWs here!).
But the DVD's (DVD, DVD+RW) just won't mount.
Everything worked fine yesterday. I've listened to two DVDs. I've listened to a 
CD. I've put back one of the two DVDs in the drive: nothing.
I've tried another DVD and nothing too. The DVDs were not mounting. Rebooting 
haven't solved anything, ubuntu is still acting like there's *no* DVD in the 
drive.

The "sudo mount" command in the terminal just freezes. "sudo eject" too.
So, briefly: Ubuntu just ate my Rammstein DVD.

Interesting messages in /var/log/syslog:
Feb 23 20:23:15 A99-LeDechaine kernel: [13316.225187] hdc: tray open
Feb 23 20:23:15 A99-LeDechaine kernel: [13316.226552] end_request: I/O error, 
dev hdc, sector 64
Also:
Feb 23 20:23:37 A99-LeDechaine kernel: [13338.372455] UDF-fs: No partition 
found (1)
Also:
Feb 23 20:17:22 A99-LeDechaine kernel: [12962.975207] hdc: tray open
Feb 23 20:17:22 A99-LeDechaine kernel: [12962.976568] end_request: I/O error, 
dev hdc, sector 0
Feb 23 20:17:22 A99-LeDechaine kernel: [12962.976581] Buffer I/O error on 
device hdc, logical block 0
Finally:
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524527] Buffer I/O error on 
device hdc, logical block 1
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524538] Buffer I/O error on 
device hdc, logical block 2
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524545] Buffer I/O error on 
device hdc, logical block 3
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524552] Buffer I/O error on 
device hdc, logical block 4
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524559] Buffer I/O error on 
device hdc, logical block 5
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524565] Buffer I/O error on 
device hdc, logical block 6
Feb 23 20:46:44 A99-LeDechaine kernel: [14724.524572] Buffer I/O error on 
device hdc, logical block 7

I'm using Ubuntu 7.10 (Gutsy) on a P3 866.
My CD/DVD drive is a HL-DT-ST DVDRAM GSA-4160B

~$ uname -a
Linux A99-LeDechaine 2.6.22-14-generic #1 SMP Sun Oct 14 23:05:12 GMT 2007 i686 
GNU/Linux

The DVD drive worked flawlessly under windows for 3-4 years (or even more).
The DVD disk is a brand new DVD I bought 3-4 days ago.
So I guess the problem is in Ubuntu.

-- 
DVD/CDRW drive doesn't recognize any dvd disks (data DVD and video DVD)
https://bugs.launchpad.net/bugs/16351
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