rip DVD's?
Rashkae
ubuntu at tigershaunt.com
Sat Nov 22 04:28:27 UTC 2008
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)
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