How to do the md5sum verify of a cdrom?

Davigetto · 2007-08-22 23:09:16

Hello, I want to get the md5sum of a DVD, to make sure that isos that I made are correct, but by terminal.

I am trying to do the following, and I always I'm getting the same error:

[davigetto@helena ~]$ md5sum /dev/sr0
md5sum: /dev/sr0: I/O error

I have tried with /dev/dvd and /dev/cdrom, but they doesn't work.

What can I do to get de md5sum of a DVD correctly?

Greetings

Last edited by Davigetto (2007-08-22 23:09:35)

Misfit138 · 2007-08-22 23:17:53

Hmm, mine works with /dev/cdrom. My user is in the optical and storage groups, and the cd is mounted.

Davigetto · 2007-08-23 00:04:52

I am getting the same errors as a root also, and I'm on that groups

[vEX] · 2007-08-23 11:39:36

I think I read somewhere that you could do something like this: "dd if=/dev/dvd | md5sum" but I'm not sure it would work. Let me try and find it again.

EDIT: Found it here, looks like it was partially correct, you need to add some more options to dd, check the URL. Also found this python script another Arch user put together for verifying burns: http://bbs.archlinux.org/viewtopic.php?pid=262760.

Last edited by [vEX] (2007-08-23 11:43:44)

Bebo · 2007-08-23 13:45:52

When I verify that a burned CD or DVD is "equal" to an ISO file, I use the dd method posted above, but pipe the dd output to diff with the -Hqs options and compare the disc data to the ISO file data on the fly. I believe (not sure ) that it saves some time. I also like to use pipeviewer (called pv, it's in community) to have a progress bar. I have a (rather long) script for this, but the "core" is this:

#!/bin/sh

IMAGE="$1"

BURNER=/dev/dvd

BLOCKSIZE="$(isoinfo -d -i $BURNER | grep "^Logical block size is:" | cut -d " " -f 5)"
BLOCKCOUNT="$(isoinfo -d -i $BURNER | grep "^Volume size is:" | cut -d " " -f 4)"

IMAGESIZE=$(($BLOCKSIZE * $BLOCKCOUNT))

dd if=$BURNER bs=$BLOCKSIZE count=$BLOCKCOUNT conv=notrunc | pv -N " Reading data" -s $IMAGESIZE | diff -Hqs - "$IMAGE"

Davigetto · 2007-08-23 18:42:30

veX, your information is really interesting, I have tested the python script and works well, but I never get the same md5 match (maybe all my cd's are wrong? :S)

Bebo, which command much I use to get your script working? ./beboscript image.iso??

greetings and thanks

Bebo · 2007-08-23 18:56:59

Davigetto wrote:

Bebo, which command much I use to get your script working? ./beboscript image.iso??

Yes, exactly Save the script somewhere, chmod 755 it, and then run it with the ISO image as argument.

Davigetto · 2007-08-23 21:27:49

ok, thank you very much all

Greetings

Arch Linux

#1 2007-08-22 23:09:16

How to do the md5sum verify of a cdrom?

#2 2007-08-22 23:17:53

Re: How to do the md5sum verify of a cdrom?

#3 2007-08-23 00:04:52

Re: How to do the md5sum verify of a cdrom?

#4 2007-08-23 11:39:36

Re: How to do the md5sum verify of a cdrom?

#5 2007-08-23 13:45:52

Re: How to do the md5sum verify of a cdrom?

#6 2007-08-23 18:42:30

Re: How to do the md5sum verify of a cdrom?

#7 2007-08-23 18:56:59

Re: How to do the md5sum verify of a cdrom?

#8 2007-08-23 21:27:49

Re: How to do the md5sum verify of a cdrom?

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