well i just burned a couple of cds from itunes and found that they won't play in my radio shack cd player but will play in my sony dvd/cd player. they are cd-rw disc and when i used toast 7 to burn them it said that most players won't play cd-rw disc. i have a few cd-r but when i try to erase them it says that theres no disc in the tray. what am i doing wrong.