rip DVD's?

[Rashkae]

Brian McKee wrote:
> On Fri, Nov 21, 2008 at 2:10 PM, Rashkae <ubuntu at tigershaunt.com> 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.
> 
> Brian

Test this with a DVD+R disc rather than CD, and I think you will see the
anomaly I mentioned.  (Or at least, this has been the case with the past
3 generations of LG drives I've owned)