Yesterday i posted a question about an ipod .?

I'm having problems keeping music on when i put a new cd on it deletes an album from my ipod with out asking well,we have bought some itunes and they stay on all the time and apparently your itunes will stay on but when you add more music from anything but itunes it will delete an album,they don't tell you in the shop when you buy it that you need a cheat to override this its such a con so now i have to find a cheat what a pain.