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. _______________________________________________ clug-talk mailing list [EMAIL PROTECTED] http://clug.ca/mailman/listinfo/clug-talk_clug.ca
