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

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Hi,

md wrote:
> When copying a dvd to file on the harddrive, I'm getting [...]
> 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

Do you see fresh messages in the output of dmesg ?
Like

  Dec  2 13:56:33 ... kernel: [...] Sense Key : Medium Error [current]
  Dec  2 13:56:33 ... kernel: [...] Info fld=0x69c0
  Dec  2 13:56:33 ... kernel: [...] sr 2:0:0:0: [sr0]
  Dec  2 13:56:33 ... kernel: [...] Add. Sense: Unrecovered read error
  Dec  2 13:56:33 ... kernel: [...] sr 2:0:0:0: [sr0] CDB:
  Dec  2 13:56:33 ... kernel: [...] Read(10): 28 00 00 00 69 b8 00 00 40 00

What do you get from

  xorriso -outdev /dev/sr0 \
          -check_media use=outdev \
          data_to=/sdb1/movie.udf \
          --

(It will at least show error messages directly.)


Gene Heskett wrote:
> Classic slow spinup.

After 33 MiB of reading ?

(We have a bug in the kernel since 2008 which prevents waiting for the
 drive to become ready after automatic tray loading. But this causes
 0 bytes of read result and lets dd end immediately.)


> You can get a better dvd drive

Read failures of decaying drives often show surprising success-or-error
patterns. Depending on how idvdbackup accesses the drive, its doings
 might be beneficial.
But reading in

  http://manpages.ubuntu.com/manpages/bionic/man1/dvdbackup.1.html
  "-M, --mirror
                 backup the whole DVD"

i'd expect it to read sequentiall, like dd does.

So more questions to md:

- Does a second or third dd run yield success if no dvdbackup was run
  inbetween ?

- Does dvdbackup yield a complete set of files if you let it work
  until it ends on its own ?


Have a nice day :)

Thomas

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Thread

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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