2009/11/18 José Romildo Malaquias <j.romi...@gmail.com>: > On Tue, Nov 17, 2009 at 04:54:20PM +0000, Grant Edwards wrote: >> On 2009-11-17, Marcus Wanner <marc...@cox.net> wrote: >> >> > My guess is that he has a slow internet connection, he >> > downloaded a large iso, burned it, deleted it, and now wants >> > to get the iso back without downloading it again, but he has >> > access to the checksum/filesize of the original iso from the >> > place he downloaded it, and when he makes an iso, the >> > checksum/filesize does not match. >> >> In my experience that happens because one or the other of the >> images has "extra" garbage blocks past the end of the actual >> ISO filesystem image. If you look at the ISO filesystem header >> and find the actual size of the image, it's probably smaller >> than the "image file". If you only compare the bytes within >> the ISO image itself, I bet the two will match. > > In fact the size of the iso images obtained with dd and with cdread are > a little bit larger than the original one. The iso image obtained by > mkisofs on the mounted disc (with the udf filesystem type) are of the > right size, but still not identical to the original.
This webpage has some info about comaring ISO images to burnt discs and a possible solution: http://twiki.org/cgi-bin/view/Wikilearn/CdromMd5sumsAfterBurning
