[webber]

like the above mentioned post says you need to modify your dreamcast,
what you need to do is adjust the "pot" on the dreamcast, pot is short for potentiometer and potential is related to voltage there but increasing the pot you increase the laser to be able to read the cdrw format
there should be specs on how to do this properly on dccopyworld.com
i did it on mine and it works fine,
i believe that the largest cdrw is only 600MB or not i am not sure (correct me and forgive me if i am wrong) but i think i saw some at Business Depot here in Canada

regards
webber