In my last post I was thinking about purchasing the HP internal unit. According to the HP site the dvd-rw's are compatable with alot of players on the market. I went to the Circuit City at the local mall where they have the burners and confused the sales associate with this question, "if the dvd-rw is anything like the cd-rw, how is it compatable with other units outside itself if the disc is technically not closed like a cd-r or a dvd-r would be" And also, is the HP unit burn to dvd-r's according to the box it only does the dvd-rw's......any ideas??