In <[🔎] 20090331075641.GB18916@fantomas.sk>, Matus UHLAR - fantomas wrote: >> On 29.03.09 16:27, Boyd Stephen Smith Jr. wrote: >> > Not in my experience. Both DVDs and CDs have a physical sector size. If >> > the image is not a multiple of that sector size, the md5sum of the block >> > device and the image will differ, because of the extra bits in the last >> > physical sector. > >On 31.03.09 09:53, Matus UHLAR - fantomas wrote: >> afaik, if the same image is written to multiple CDs/DVDs, they all should >> have the same md5sum, independently on its size. That is the one md5sum >> shjould report. The same for sha1sum. While this may be true, the comparison asked about (and that I normally do) is between an ISO file and a physical DVD. ISO files is want to burn generally have not been produced by dd'ing a physical DVD, so they may not take into account the physical limitations on the medium. I would love it if 'md5sum /path/to/iso /dev/dvd' gave two lines with the same sum. It does not usually happen that way, here. I have to trim the /dev/dvd device to have exactly the same byte count as the iso file first. >... could this problem come out of fact that there was something different >burned on those medias before? No, my experience is mainly with WORM optical media. -- Boyd Stephen Smith Jr. ,= ,-_-. =. bss@iguanasuicide.net ((_/)o o(\_)) ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' http://iguanasuicide.net/ \_/
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