when i burn my iso file to dvd+-rw disc, when i go to erase it to write something else, multiple programs tell me its a single layer, dvd rom, closed...

and reads the disc as if its not rewritable anyone know why? this is on my philips drive... but if i use my dads pc which is a nec 3530 drive, it reads the disc as dvd+-rw and open and lets me erase the disc?

any idea to why the philips is reading the disc differently?

thankyou