Burning music CD's

[ROX]

I was hoping someone could explain why when I burn a new CD, only certain cd players play it and other players won't recognize the format.

I used a CD-R disk to burn some songs and now it won't play in our Strawberry Shortcake CD player. What' up with that? The Strawberry Shortcake (SS) player is about 20 years newer than our old CD player and it won't play it, but the old one will.

Am I using the wrong disk?

Thanks.