R's and RW's have different layering (think thats the word I am looking for) and many CD player's cannot play RW discs because of this... I know NONE of my CD players, beit in the house (3 different CD players) or in the car will play RW discs, even if I finalise the disc and "close session" after burning... They will play R's tho...

The only machines I have been able to play RW's on have been the three DVD players in the house (tho my PS2 wouldn't play them), and the two PC's...