I've install WIN7 prof. 32-bit and any CD-R (even original one) is shown as empty. DVD-R,DVD+R works properly.
Under old Vista Home Premium CD-R worked fine on this Notebook ASUS F3F. No original drivers were instaled, since asus have no support for WIN7. WIN7 recognized my DVD-RAM as matshita dvd-ram uj-850S ata device, drivers up-to-date.