rip DVD's?

[Rashkae]

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)
> 
> Brian
> 

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)