Illegal Disc error on a sony dru+\-720A only with dvd-rw (dvd+rw works) please help

good day everyone,
well i have the dru-720a and works fine except with dvd-rw discs, i have a +rw and it workes fine, when i try to burn with the -rw it pops out and says illegal disc bur proccess failed. im not sure if its related but i have a dvd-ram disc that also does not work.

has anyone heard or know of this problem?
thanks in advance. :cool:

The DRU-720A doesnโ€™t handle DVD-RAM discs.

What brand and rated speed are your -RW discs?

TDK x4

Can you find out the media code of that TDK media? Instructions: