rip DVD's?

Brian McKee brian.mckee at
Fri Nov 21 19:15:22 UTC 2008

On Fri, Nov 21, 2008 at 2:10 PM, Rashkae <ubuntu at> wrote:
> Brian McKee wrote:
>> Related question.  Why check the volume size?  Won't dd stop when it
>> reaches the end on it's own?  Just curious, haven't actually tried it
>> (but I should, maybe I'll go do that now)

> I think it depends on the drive, (and this applies more to recorded
> DVD-R's than commercial pressed DVD's)
> It's a common problem that dd will read past the end of the file system
> image and append Null characters to the image until it hits an I/O error.
> The resulting image will still work perfectly, but will never have the
> same md5 sum as the original (and will be several bytes longer every time)

Ah.  Cool, thanks.    I tried it here without the block size on a very
small cd (12ish meg), and it worked and the checksums passed, but as
you said, it's probably drive/media dependent.  I'll try and file that
tidbit in memory.


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