On Sunday 17 September 2006 04:39, Nils Breunese (Lemonbit Internet) wrote: >Gene Heskett wrote: >> I have now burnt 2 copies of the FC-6T2-live-dvd.iso, one on a +dvd >> and one >> on a -dvd disk. >> >> Both of these freshly written dvd's check with an identical sha1sum >> when >> doing a 'sha1sum -b /dev/cdrom'. >> >> But it doesn't match the sha1sum of the iso I started with! >> >> Is this a known problem? Fixable by turning off the dma on /dev/ >> hdc maybe? >> >> System is an FC2 box, with a newer kde-3.3.0, so k3b is still using >> md5sums >> which of course fail to check too. > >Actually I'm not really sure running sha1sum on the device should >give the same sum as running it on the iso file. I believe the >standard procedure is to run sha1sum on the iso after you've >downloaded it and then check the outcome. Did you do that? Yes. >Burning >software should take of making sure it's properly burning the iso >after that. Also, did you run the built-in media check when you start >the installer and did that give you OK? Well, my copy of k3b is a bit old & uses md5sums yet. However, I'd since made the discovery that if I do it by hand, by first dividing the size of the iso by 2048, then doing this: dd if=/dev/cdrom bs=2048 count=(result of the above division) | md5sum or sha1sum then the *sums are correct. So its probably a case of the filesystem, using dma, and its not knowing when to quit reading the dma buffer problem, and thats been mentioned before. However, the mediacheck has been known to fail while the disk reads fine, or the mediacheck was ok, and the disk failed to find a file 20 minutes later during the install, so thats not been a 100% bulletproof check in my experience here. Sometimes I don't fully apply the brain before posting, but if my experiences and frustrations help someone else, its all for a good cause I think. Thanks Nils. >Nils Breunese. > > >-- >fedora-legacy-list mailing list >fedora-legacy-list@xxxxxxxxxx >https://www.redhat.com/mailman/listinfo/fedora-legacy-list -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Yahoo.com and AOL/TW attorneys please note, additions to the above message by Gene Heskett are: Copyright 2006 by Maurice Eugene Heskett, all rights reserved. -- fedora-legacy-list mailing list fedora-legacy-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-legacy-list
