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Groups > linux.debian.user > #158099

Re: Narrowing down problem source

From Richard Owlett <rowlett@cloud85.net>
Newsgroups linux.debian.user
Subject Re: Narrowing down problem source
Date 2015-09-20 22:30 +0200
Message-ID <qaTpg-1Zo-17@gated-at.bofh.it> (permalink)
References <qa43o-41T-7@gated-at.bofh.it> <qa4d4-4d9-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Thomas Schmitt wrote:
> Hi,
>
>> My later comments of run-to-run inconsistencies with dd and your recommended
>> tests were all using my home directory.
>
> In this case any dd run with short result file should issue
> some error message and/or there should be some hardware
> error message in the system logs.
>

I captured a test run with the script command.
NOTE dd copies exactly same number of records for differently 
sized DVDs :{
Result was:

[snip]
]0;richard@debian-8: ~richard@debian-8:~$
]0;richard@debian-8: ~richard@debian-8:~$ N=0
]0;richard@debian-8: ~richard@debian-8:~$
]0;richard@debian-8: ~richard@debian-8:~$ F="JessieDVD"
]0;richard@debian-8: ~richard@debian-8:~$
]0;richard@debian-8: ~richard@debian-8:~$ E='.iso'
]0;richard@debian-8: ~richard@debian-8:~$
]0;richard@debian-8: ~richard@debian-8:~$ while true
>
>   do
>
>     let N=N+1
>
>      echo "Insert medium, wait until blinking ends, press Enter key (or Ctrl+C
  to end)"
>
>     read dummyvar
>
>     blocks=$(expr $(/sbin/isosize /dev/sr0) / 2048)
>
>     echo "Block count: "$blocks
>
>     echo "Byte count: $(expr $blocks '*' 2048)"
>
>     FILENAME=$F$N$E
>
>     echo "The output file will be $FILENAME"
>
>     echo ""
>
>     dd if=/dev/sr0 bs=2048 count=$blocks of=$FILENAME
>
>     echo ""
>
>     echo "next lines are output of ls and isosize commnds"
>
>     ls -l $FILENAME
>
>     /sbin/isosize $FILENAME
>
>     echo "about to repeat loop"
>
>     echo ""
>
>   done
Insert medium, wait until blinking ends, press Enter key (or 
Ctrl+C to end)
Block count: 1941504
Byte count: 3976200192
The output file will be JessieDVD1.iso

1941504+0 records in
1941504+0 records out
3976200192 bytes (4.0 GB) copied, 876.109 s, 4.5 MB/s

next lines are output of ls and isosize commnds
-rw-r--r-- 1 richard richard 3976200192 Sep 20 13:39 JessieDVD1.iso
3976200192
about to repeat loop

Insert medium, wait until blinking ends, press Enter key (or 
Ctrl+C to end)

Block count: 2284052
Byte count: 4677738496
The output file will be JessieDVD2.iso

1941504+0 records in
1941504+0 records out
3976200192 bytes (4.0 GB) copied, 733.727 s, 5.4 MB/s

next lines are output of ls and isosize commnds
-rw-r--r-- 1 richard richard 3976200192 Sep 20 13:52 JessieDVD2.iso
4677738496
about to repeat loop

Insert medium, wait until blinking ends, press Enter key (or 
Ctrl+C to end)
^C
]0;richard@debian-8: ~richard@debian-8:~$ exit

Script done on Sat 20 Sep 2014 01:53:32 PM CDT

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Thread

Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 15:10 +0200
  Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 15:20 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 16:10 +0200
      Re: Extracting directories from an ISO image, command line tool? The Wanderer <wanderer@fastmail.fm> - 2015-09-10 16:30 +0200
        Re: Extracting directories from an ISO image, command line tool? The Wanderer <wanderer@fastmail.fm> - 2015-09-10 16:30 +0200
      Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 17:00 +0200
        Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 17:20 +0200
          Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 18:20 +0200
            Re: Extracting directories from an ISO image, command line tool? Hans <hans.ullrich@loop.de> - 2015-09-10 18:30 +0200
              Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 20:50 +0200
                Re: Extracting directories from an ISO image, command line tool? Hans <hans.ullrich@loop.de> - 2015-09-10 21:10 +0200
                Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 21:30 +0200
                Re: Extracting directories from an ISO image, command line tool? Curt <curty@free.fr> - 2015-09-10 22:10 +0200
                Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 23:00 +0200
                Re: Extracting directories from an ISO image, command line tool? Lisi Reisz <lisi.reisz@gmail.com> - 2015-09-11 15:40 +0200
                Re: Extracting directories from an ISO image, command line tool? Chris Bannister <cbannister@slingshot.co.nz> - 2015-09-11 16:50 +0200
          Re: Extracting directories from an ISO image, command line tool? Lisi Reisz <lisi.reisz@gmail.com> - 2015-09-11 15:40 +0200
  Re: Extracting directories from an ISO image, command line tool? The Wanderer <wanderer@fastmail.fm> - 2015-09-10 15:30 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 16:20 +0200
      Re: Extracting directories from an ISO image, command line tool? The Wanderer <wanderer@fastmail.fm> - 2015-09-10 16:30 +0200
        Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 17:40 +0200
          Re: Extracting directories from an ISO image, command line tool? The Wanderer <wanderer@fastmail.fm> - 2015-09-10 17:50 +0200
      Re: Extracting directories from an ISO image, command line tool? Eduard Bloch <edi@gmx.de> - 2015-09-10 16:30 +0200
  Re: Extracting directories from an ISO image, command line tool? Darac Marjal <mailinglist@darac.org.uk> - 2015-09-10 15:30 +0200
    Re: Extracting directories from an ISO image, command line tool? The Wanderer <wanderer@fastmail.fm> - 2015-09-10 16:30 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 16:30 +0200
  Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-10 16:40 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-10 17:30 +0200
    Re: Extracting directories from an ISO image, command line tool? David Wright <deblis@lionunicorn.co.uk> - 2015-09-10 22:50 +0200
      Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-11 10:30 +0200
        Re: Extracting directories from an ISO image, command line tool? David Wright <deblis@lionunicorn.co.uk> - 2015-09-11 18:50 +0200
          Re: Extracting directories from an ISO image, command line tool? Curt <curty@free.fr> - 2015-09-12 10:10 +0200
          Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-12 11:00 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-13 23:20 +0200
      Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-14 00:40 +0200
        Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-14 03:00 +0200
          Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-14 10:20 +0200
            Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-14 16:40 +0200
              Narrowing down problem source - was [Re: Extracting directories from  an ISO image, command line tool?] Richard Owlett <rowlett@cloud85.net> - 2015-09-17 17:00 +0200
                Re: Narrowing down problem source - was [Re: Extracting directories from  an ISO image, command line tool?] Steve McIntyre <steve@einval.com> - 2015-09-17 18:10 +0200
                Re: Narrowing down problem source - was [Re: Extracting directories  from an ISO image, command line tool?] Richard Owlett <rowlett@cloud85.net> - 2015-09-18 13:20 +0200
                Re: Narrowing down problem source "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-17 19:20 +0200
                Re: Narrowing down problem source Richard Owlett <rowlett@cloud85.net> - 2015-09-18 14:40 +0200
                Re: Narrowing down problem source "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-18 15:00 +0200
                Re: Narrowing down problem source Richard Owlett <rowlett@cloud85.net> - 2015-09-18 15:40 +0200
                Re: Narrowing down problem source "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-18 15:50 +0200
                Re: Narrowing down problem source Richard Owlett <rowlett@cloud85.net> - 2015-09-20 22:30 +0200
                Re: Narrowing down problem source "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-21 08:20 +0200
                Re: Narrowing down problem source Richard Owlett <rowlett@cloud85.net> - 2015-09-21 19:00 +0200
                Re: Narrowing down problem source "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-21 20:30 +0200
  Re: Extracting directories from an ISO image, command line tool? David Wright <deblis@lionunicorn.co.uk> - 2015-09-10 17:10 +0200
    Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-10 19:40 +0200
  Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-11 14:10 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-11 17:40 +0200
      Re: Extracting directories from an ISO image, command line tool? Brian <ad44@cityscape.co.uk> - 2015-09-11 18:50 +0200
  Re: Extracting directories from an ISO image, command line tool? Stuart Longland <stuartl@longlandclan.id.au> - 2015-09-17 22:50 +0200
    Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-18 14:00 +0200
      Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-18 14:30 +0200
        Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-18 15:50 +0200
      Re: Extracting directories from an ISO image, command line tool? Stuart Longland <stuartl@longlandclan.id.au> - 2015-09-23 04:30 +0200
        Re: Extracting directories from an ISO image, command line tool? Richard Owlett <rowlett@cloud85.net> - 2015-09-23 16:00 +0200
          Re: Extracting directories from an ISO image, command line tool? "Thomas Schmitt" <scdbackup@gmx.net> - 2015-09-23 20:10 +0200

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