Yeah some do - my bro's Kenwood plays CD-RW discs, but the majority don't play em.... Has to do with what the laser can read, and CD-RW's use something different (don't know if it's the layer material or the burn procedure, therefore data write) so that they can be wiped and re-recorded on... So the player has to have the data/info/software to be able to decipher the data on the CD-RW, and might even have to have a better/different laser to pick it out...