Dawid Busse wrote:
> 1) Is it possible to set pipe size (and how) to let's say 30MB or is there some 
> pipe-buffering tool?

dd ... bs=30m

> 2) Any other ideas how to do some growisofs buffering?

While lots of things are possible, the most reliable way of getting an image 
available for high-speed burning is to prepare the .iso image seperately into a 
file via mkisofs, and then burn that file directly.  Creating the .iso image 
can require a lot of disk seeks and so forth which are minimized when you just 
read a single large image file.

-- 
-Chuck