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Re: checking integrity of already written CD/DVD



> >On Sun,29.Mar.09, 20:28:44, Angelin Lalev wrote:
> >> Is there a way to check a written DVD against the checksum of the iso
> >> image written on it?

> In <20090329202842.GA3540@think.homelan>, Andrei Popescu wrote:
> >$ md5sum /dev/dvd
> >
> >This should result in *exactly* the same checksum as the iso

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.

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. 

-- 
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