Burning ISO Image and simultaneous MD5 check

I may be dreaming but I am sure on one occasion I found a tool which burnt iso image and checked md5 sum at the time of doing the burn. I have iso and md5 zipped together and want to do this but was I dreaming or can somebody suggest program that does what I want?
Budgie2

On Mon, 20 Feb 2012 21:46:03 +0000, Budgie2 wrote:

> I may be dreaming but I am sure on one occasion I found a tool which
> burnt iso image and checked md5 sum at the time of doing the burn. I
> have iso and md5 zipped together and want to do this but was I dreaming
> or can somebody suggest program that does what I want?

I don’t think it would be possible to simultaneously burn and perform the
MD5 check, since read and write are discretely separate operations - it
would slow the burning process down because the write would have to be
stopped, a read performed, and the appropriate MD5 calculation done on
the most recent byte of data done, followed by resuming the write.

The write would still finish as there would be no way to know that there
was a problem based on an incomplete burn based on MD5 data.

Jim


Jim Henderson
openSUSE Forums Administrator
Forum Use Terms & Conditions at http://tinyurl.com/openSUSE-T-C

On 2012-02-20 22:46, Budgie2 wrote:
>
> I may be dreaming but I am sure on one occasion I found a tool which
> burnt iso image and checked md5 sum at the time of doing the burn. I
> have iso and md5 zipped together and want to do this but was I dreaming
> or can somebody suggest program that does what I want?

I don’t think you can find that.

A normal disk write, yes, but a burn… :-?


Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)

The two operations cannot be simultaneously executed with meaningful results. One checks MD5 sum to check if the ISO image is OK before committing the burn process. It would be of course possible for a program to automatically check the MD5 sum and if the result is OK, immediately proceed with the burn! That is what you would be looking for if I understand your message. Else one will end up with a lot of spoilt discs, one each time the MD5 sum indicates error!

PrakashC

To me, it would matter what MD5 checksum you’re comparing… AFAIK the checksum value is calculated only against a static (non-changing) file, so there is no such thing as doing checksums during the burning process (only before and after), and although it might be possible to do a checksum against each individual installation file I think conventional thought is it’s a big waste of time(The ISO checksum should be sufficient).

If you’re asking about the ISO checksum, burners like k3b will display the checksum of the source media visually <before> you commence burning.

TS

I am sorry, I was inaccurate with my description and understand I was asking the impossible.
I did not mean simultaneous but sequentially as part of the same program. I thought K3b did this but I must have mine set up incorrectly as it will burn an iso image but does not ask if I want to check the md5sum.
Sorry I mislead. Can anybody now please advise.

k3b does show the MD5 sum automatically before burning. Immediately when you select the ISO file, a progress bar appears (1%, 2%… 99%) showing the calculation of the MD5 sum, usually takes just a couple of seconds. When the bar hits 100%, the checksum is displayed.
K.

Thanks for the info but I cannot see it. The download is a zip file with two files, the iso image and md5sum. I tried selecting the iso image within the zipped file and made a beer mat of the zipped file. I then extracted the files and burnt the image but at no point was an md5sum displayed for me to compare neither was there any request for me to point to the extracted md5sum result for comparison. Where am I going wrong?

On 2012-02-22 19:26, Budgie2 wrote:
> Thanks for the info but I cannot see it. The download is a zip file
> with two files, the iso image and md5sum. I tried selecting the iso
> image within the zipped file and made a beer mat of the zipped file. I
> then extracted the files and burnt the image but at no point was an
> md5sum displayed for me to compare neither was there any request for me
> to point to the extracted md5sum result for comparison. Where am I
> going wrong?

I tried just now. I opened k3b, clicked on an iso file, an a dialog opened
which inmediately started calculating the checksum. A checkbox at the
bottom is not selected, but says “verify recorded data” (in Spanish).

Maybe you do not have installed “md5sum”.


Cheers / Saludos,

Carlos E. R.
(from 11.4 x86_64 “Celadon” at Telcontar)