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Curtis Sloan wrote:
On Wed, 2004-01-21 at 13:29, Jason Louie wrote:
Thanks Curtis, that explains things. Now the question remains. How to verify the CD after it's been burnt? You stated before that there are checksums that certain distros provide. But I haven't been able to find such a list, (ie: fedora).
You're right, I have not been able to find a comprehensive list of MD5sums for Fedora either. I'm not current on Fedora's existence/development, but possibly there isn't a comprehensive one (yet) and one would have to compile a list from Red Hat + individual Fedora contributions. I could be out to lunch. I hope so for your sake. :-)
I won't start a distro war, but I will say "Thank you, Patrick (Volkerding)!" ;-)
Curtis
Just want to make sure that the CD is good before offering it to others.
Curtis Sloan wrote:
On Wed, 2004-01-21 at 11:43, Jason Louie wrote:
But is this producing the same MD5 checksum directly from the CD as
the ISO?
I'm not sure if I understand what you are asking, so let me rephrase the question and you can correct me if I'm misunderstanding:
"Is the MD5 checksum of the CD (i.e. /dev/cdrom) the same as the MD5 checksum of the .iso file (before it was burned)?"
If this is the question you are asking, then the answer is no. They will always be different.
The answer lies is in the way the MD5 algorithm works. It produces a unique 128-bit checksum for any given arrangement of bytes.
In this case, the arrangement of the bytes in an ISO file is distinctly different than that of the exact same bytes laid out in a filesystem (i.e. after burning). The MD5 algorithm doesn't care that they are the same bytes, since (from the algorithm's perspective) the single ISO file is fundamentally different than the collection of files taken as a whole. One MD5 will be a "fingerprint" of an ISO file, the other of an entire filesystem. The difference can seem semantic, but viewed from an algorithm's point of view, it can make sense.
This may account for apparent discrepancies in MD5s (if I understood your question correctly).
HTH, Curtis
I've seem lots of examples on the web on the process of verifying CDs burnt from ISOs but I can't seem to reproduce the results. I only have access to a burner on a Win system and I'm wondering if that is the reason why the MD5s are different.
Pete wrote:
Linux commandline burning works for me...
http://www.yolinux.com/TUTORIALS/LinuxTutorialCDBurn.html
There are a few examples of commands to copy CDs
Peter
Jason Louie wrote:
Has anyone been able to verify the *burned* copy of the ISO? Also what programs are you guys using for the burning? I'm using Nero on a Win system. I have lots of distros that I would like to share but I don't feel good about having them available when I'm not sure if they're good. I haven't been able to get matching results with doing an MD5 check on the CD so I was wondering if anyone has been getting better results.
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