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dd: error reading '/dev/sr0': Input/output error

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When copying a dvd to file on the harddrive, I'm getting the message
dd: error reading '/dev/sr0': Input/output error
If I first run dvdbackup, then Ctrl-C out of it. I can then reissue the dd command and it will finish fine. If I eject the dvd then insert another dvd, the same situation occurs.

My system:

MD> lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 9.6 (stretch)
Release:        9.6
Codename:       stretch

example terminal session::

MD> sudo dd if=/dev/sr0 of=/sdb1/movie.iso
32596480 bytes (33 MB, 31 MiB) copied, 7.00018 s, 4.7 MB/s
dd: error reading '/dev/sr0': Input/output error
67688+0 records in
67688+0 records out
34656256 bytes (35 MB, 33 MiB) copied, 7.55342 s, 4.6 MB/s

MD> dvdbackup -M
libdvdread: Attempting to retrieve all CSS keys
libdvdread: This can take a _long_ time, please be patient
libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x00000142
libdvdread: Elapsed time 0
<snip>
libdvdread: Elapsed time 0
^C
MD> sudo dd if=/dev/sr0 of=/sdb1/movie.iso status=progress
7996654080 bytes (8.0 GB, 7.4 GiB) copied, 1831 s, 4.4 MB/s
15621264+0 records in
15621264+0 records out
7998087168 bytes (8.0 GB, 7.4 GiB) copied, 1831.44 s, 4.4 MB/s

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dd: error reading '/dev/sr0': Input/output error md <mickydean@protonmail.com> - 2018-12-10 07:00 +0100
  Re: dd: error reading '/dev/sr0': Input/output error Gene Heskett <gheskett@shentel.net> - 2018-12-10 07:50 +0100
  Re: dd: error reading '/dev/sr0': Input/output error "Thomas Schmitt" <scdbackup@gmx.net> - 2018-12-10 08:50 +0100
    Re: dd: error reading '/dev/sr0': Input/output error Gene Heskett <gheskett@shentel.net> - 2018-12-10 09:30 +0100
      Re: dd: error reading '/dev/sr0': Input/output error "Thomas Schmitt" <scdbackup@gmx.net> - 2018-12-10 09:50 +0100
        Re: dd: error reading '/dev/sr0': Input/output error Gene Heskett <gheskett@shentel.net> - 2018-12-10 14:00 +0100
    Re: dd: error reading '/dev/sr0': Input/output error Jude DaShiell <jdashiel@panix.com> - 2018-12-10 10:20 +0100
      Re: dd: error reading '/dev/sr0': Input/output error "Thomas Schmitt" <scdbackup@gmx.net> - 2018-12-10 10:40 +0100
        Re: dd: error reading '/dev/sr0': Input/output error Gene Heskett <gheskett@shentel.net> - 2018-12-10 14:30 +0100
      Re: dd: error reading '/dev/sr0': Input/output error Gene Heskett <gheskett@shentel.net> - 2018-12-10 14:10 +0100
  Re: dd: error reading '/dev/sr0': Input/output error Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-12-10 20:50 +0100

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