master or slave wouldn't affect the fact that it is read as a cd-rom. Are you sure, pop a clean cd-r or cd-rw in the drive and a promp should open asking what to do. Click open folder to view files. Then when your window opens it should say in the 'things to do list' (top left of the window) and in that list it should have "burn to disk", if so then it might read as a cd-rom but works like a cd burner. Oh thats for windows xp, what os do you have.
(I am sure you know how to burn a disk, right?)