[Wlug] ML 370 + DVD RW

Friends, I have HP ML 370p with DVD RW. Here, I have tried to install RHEL 4 ES, but not work with several diffrent error listed during the installation. But, its all ok after replacing the DVD RW with common cd rom. can you help me here how to copy data from physical hardisk to a blank dvd drive ? whats the command ? Thanks all. Regards, Aramico