Comments on: Verify a burned CD/DVD image on Linux http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/ An open-source software and technology related journal Sun, 28 Feb 2010 05:55:55 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: GNot http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-6470 GNot Tue, 20 Feb 2007 07:21:53 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-6470 That would be a nice idea! Msg me to add a link whenever or if it happens :-) Also, thanks for your kind words. I am glad you have found this information helpful. That would be a nice idea! Msg me to add a link whenever or if it happens :-)

Also, thanks for your kind words. I am glad you have found this information helpful.

]]> By: taygan http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-6429 taygan Sun, 18 Feb 2007 17:12:40 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-6429 Whoa, this is great! THANK YOU! I've been using this info a lot, it's a well-used bookmark. I *LOVE* pv for watching the progress. cdck is excellent too, but I found I need dmesg *after* a cdck to check the bad sectors. Now just to combine everything with md5check from etree-scripts for those DVD-archives of my flac files.. Now for a frontend or script that combines the md5sum, cdck and dmesg, uhhhh, I'll put it on the project list :) Whoa, this is great! THANK YOU!

I’ve been using this info a lot, it’s a well-used bookmark. I *LOVE* pv for watching the progress. cdck is excellent too, but I found I need dmesg *after* a cdck to check the bad sectors.

Now just to combine everything with md5check from etree-scripts for those DVD-archives of my flac files..

Now for a frontend or script that combines the md5sum, cdck and dmesg, uhhhh, I’ll put it on the project list :)

]]> By: Luc (Fr) http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5446 Luc (Fr) Thu, 04 Jan 2007 07:57:32 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5446 Hi! I find another way of doing it here : http://wiki.linuxquestions.org/wiki/Md5sum To check the md5sum from a just burned dvd: $ md5sum /dev/dvd Trailing zero's and nuls at the end can change the MD5 hash. So to calculate the md5sum we need to: 1) find the size of the ISO in bytes 2) run dd with this exact size in bytes: dd if=/dev/dvd | head --bytes= | md5sum So for example: $ dd if=/dev/dvd | head --bytes=3621957632 | md5sum Hi!
I find another way of doing it here :
http://wiki.linuxquestions.org/wiki/Md5sum

To check the md5sum from a just burned dvd:

$ md5sum /dev/dvd

Trailing zero’s and nuls at the end can change the MD5 hash. So to calculate the md5sum we need to:
1) find the size of the ISO in bytes
2) run dd with this exact size in bytes: dd if=/dev/dvd | head –bytes= | md5sum
So for example:

$ dd if=/dev/dvd | head –bytes=3621957632 | md5sum

]]> By: GNot http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5305 GNot Fri, 22 Dec 2006 11:02:13 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5305 An excellent find! Thanks :) An excellent find! Thanks :)

]]> By: dee http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5304 dee Fri, 22 Dec 2006 10:53:39 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5304 A handy tool for md5sums is md5deep ( http://md5deep.sourceforge.net/ ) I usually generate quickly a list of md5sums with it and I include it in the medium. Not exactly what you are trying to achieve, but a handy utility nevertheless. A handy tool for md5sums is md5deep ( http://md5deep.sourceforge.net/ )
I usually generate quickly a list of md5sums with it and I include it in the medium. Not exactly what you are trying to achieve, but a handy utility nevertheless.

]]> By: GNot http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5238 GNot Mon, 18 Dec 2006 13:23:11 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5238 Hi Dan. Thanks for this piece of info. I almost always use the "cat FILE | md5sum" form but I didn't know that there were md5sum builds around without large file support. Hi Dan. Thanks for this piece of info. I almost always use the “cat FILE | md5sum” form but I didn’t know that there were md5sum builds around without large file support.

]]> By: Dan http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5189 Dan Sun, 10 Dec 2006 22:38:35 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5189 Regarding "cat FILE | md5sum" vs. "md5sum FILE": I also use the first one as it happens that some md5sum version have a problem with the 2 GB file limit (basically not giving all needed options to the open() call). So given DVD ISO images are mostly larger than 2 GB one can bypass this error by letting cat do the open/reading and stream the result into md5sum. Regarding “cat FILE | md5sum” vs. “md5sum FILE”:
I also use the first one as it happens that some md5sum version have a problem with the 2 GB file limit (basically not giving all needed options to the open() call). So given DVD ISO images are mostly larger than 2 GB one can bypass this error by letting cat do the open/reading and stream the result into md5sum.

]]> By: GNot http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5124 GNot Mon, 27 Nov 2006 09:28:40 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5124 Hi John, IIRC the --dvd-compat switch should be used when burning dvd video, so to preserve compatibility with Hi-Fi players. Hi John,
IIRC the –dvd-compat switch should be used when burning dvd video, so to preserve compatibility with Hi-Fi players.

]]> By: john http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5100 john Thu, 23 Nov 2006 22:07:27 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5100 Hi, I ended up here when trying to verify my dvd vs the downloaded debian iso file. GNot's method makes sense to me because of the huge volume. In my case, growisofs apparently added 4096 bytes at the end of the dvd. growisofs has an option "-dvd-compat", I wonder this may be the perfect solution. Hi,

I ended up here when trying to verify my dvd vs the downloaded debian iso file. GNot’s method makes sense to me because of the huge volume.

In my case, growisofs apparently added 4096 bytes at the end of the dvd. growisofs has an option
“-dvd-compat”, I wonder this may be the perfect solution.

]]> By: GNot http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5071 GNot Thu, 16 Nov 2006 01:31:22 +0000 http://www.g-loaded.eu/2006/10/07/verify-a-burned-cddvd-image-on-linux/#comment-5071 Hello Hellfire, This is correct. The on-hard-disk ISO image is not checked, but it is assumed that the hard disk itself and mkisofs are functioning correctly, so the image contains the exact data as it is in the directory tree. This is indeed a gap in the verification process, but I suppose that it must be extremely rare to create a bad ISO image with mkisofs. Hello Hellfire,
This is correct. The on-hard-disk ISO image is not checked, but it is assumed that the hard disk itself and mkisofs are functioning correctly, so the image contains the exact data as it is in the directory tree. This is indeed a gap in the verification process, but I suppose that it must be extremely rare to create a bad ISO image with mkisofs.

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