Tony Nelson wrote: > Reading will never return more than the requested number of bytes. > It may read past the desired end of a CD or DVD. With that in mind, > read what I wrote above. If you don't understand it, ask a question.
I'm not sure what you mean by "requested number of bytes", since your command doesn't request a specific number, but relies on the OS to detect the correct size of both files (which in the case of /dev/dvd is unreliable). Your description of the possible outputs of the cmp command seems to imply that the readahead bug would cause /dev/dvd to be seen as bigger than it actually is, which is the opposite of what actually happens - there would be read errors on /dev/dvd _before_ reaching the true end of the image (making it impossible to read off the full ISO, even assuming its exact size is known).
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