Re: dd errors with certain DVDs

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On 3/25/07, Charles Curley <[email protected]> wrote:
> I am getting the errors below when I execute the command
>
> dd if=/dev/dvd of=dvd1.iso

DVD/CD buring software does wierd things so that you cannot always
depend on reading the whole thing without an error message.

To see if you got all of it, mount your iso as a loopback device:

mkdir foo
mount dev1.iso foo
mount /dev/dvd /media/<device> # as appropriate

Then diff the two:

diff -r --brief /media/<device> foo

If the result is silent, you have all the data you need.

To answer your other email, you can validate a freshly minted DVD
similarly.
Thanks, Charles. Yes, it was the error regarding dd that was causing
the md5sums mismatch (reported in the other post of mine). However,
the method that you suggest works fine, and my problem is solved. The
command dd is not very reliable, indeed.

Paul


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