Hello. My english is not good, sorry.
Well, i have a problem similar.
Have an HD s-ata, and dvd-writer s-ata too, with ubuntu 10.04 LTS.
with the dvd cant get read or write.
Sometimes read a virgin dvd, and sometimes cant mount anything.
In /dev have a device called dvd1 and dvdrw1.
I tryed to mount some of this, and nothing.
There are some problem on Ubuntu 10.04 and DVD S-ATA ¿?