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Old 12-07-2014, 09:38 PM   #1
Brant
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Does Brasero prepare or verify MD5 checksums?


Although I have been careful to verify the checksum for any ISO image I download before burning it, it took me a while to realize that the checksum for the burnt disk would be just as important.

When burning an ISO image with Brasero, at the end of the process the program spends a certain amount of time "generating MD5 checksum".

Does this mean that Brasero is generating a checksum for the disk it has burnt, and is then comparing it with the checksum sometimes included within the ISO image (which I think would be elegant) or does it mean that, if I knew how to ask, Brasero would show me the checksum for the project I had just completed?

Any info will be welcome.
 
Old 12-08-2014, 02:12 AM   #2
jdkaye
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T
Quote:
here are four plugins that come with Brasero by default in Ubuntu:

File Checksum - check the integrity of files on a disc.
Image Checksum - check the integrity of a disc image.
local-track - lets you burn network files.
normalize - gives audio CDs have a consistent sound level.
source: https://help.ubuntu.com/community/Brasero
So if you're using Ubuntu the plugin comes automatically. If not.... who knows? You don't say what distro you're using but it appears to be Ubuntu.
jdk

Last edited by jdkaye; 12-08-2014 at 02:13 AM.
 
Old 12-08-2014, 10:01 PM   #3
Brant
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I should have said: I am using Linux Mint 17.1. Checking Software Manager, there do not seem to be any uninstalled plug-ins for Brasero.

Brasero offers Tools>Test integrity. Following the instructions I found on a Brasero documentation page (see: https://help.gnome.org/users/brasero...egrity.html.en).

If, without specifying an MD5 checksum, I tell it to test the integrity of a disk, it tells me, "The file integrity check was performed successfully. There seem to be no corrupted files on the disk".
Which sounds good, but gives me the impression that it is not performing a checksum.

If I specify the MD5 checksum contained within the ISO image (in this instance I used the disk I recently burnt of Lubuntu 14.10) it returns the message: "The file integrity check could not be performed.You do not have the required permissions to use this drive."

I am assuming it would be desirable to do a checksum on a burnt disk. Am I just asking Brasero in the wrong way, or is there another way to skin this cat? I saw a mention of a utility called cfv, but I have no idea how it works.
 
Old 12-09-2014, 01:02 AM   #4
jdkaye
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Have a look at this page. According to these instructions there should be a page where you can compare the correct MD5 hashes with those that Brasero calculated from reading the disk. So look for a MD5 hash on the page you downloaded the iso from.
jdk
 
Old 12-09-2014, 02:17 PM   #5
Brant
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I confess the page concerning the MD%Sum program looked pretty daunting!
I will try to slog through it, and no doubt if I manage it I'll be feeling pleased with myself.

I still would like to know if Brasero is already doing this job for me, and is simply being coy about the answer. Since it begins and ends each burn saying it is figuring Checksums, surely it must be doing it for something?
 
Old 12-09-2014, 04:12 PM   #6
jdkaye
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It is doing something. It's calculating the MD5 hash of the iso file that it will burn. This is then checked against what the MD5 Hash should be according to where you got the iso file from. Why not post the URL of the page you're looking at. Another pair of eyes wouldn't hurt.
jdk

Last edited by jdkaye; 12-09-2014 at 04:13 PM.
 
Old 07-30-2017, 11:02 PM   #7
vdicarlo
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I think I have the same question as Brant, which may not have been understood. My question is whether Brasero automatically checks an iso generated from the disk it writes against the checksum of the source iso or whether you need to use Brasero's verify tool after you are done. According to

https://askubuntu.com/questions/5436...urn-a-data-dvd

if the standard configuration boxes are checked, Brasero does in fact compare the checksums of the source iso and disk. However, that still leaves the question of what Brasero's verify tool does. Like Brant, when I ran the tool without selecting an md5 file for comparison, Brasero reported (suspiciously) almost instantly that all was ok, but when I ran used the verify tool's option to select and verify against an md5 file downloaded from the site from which I got the iso, it reported the same failure Brant described. I ran ran a command line checksum of the downloaded iso that Brasero used as the source to burn to my dvd and it was identical to the md5 file from the site, so I know the download was ok.
 
  


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