Panzer Dragoon, AGAIN

I have completed 3 out of the four PDS discs, (i've taken them from Ralo's! FTP), and after numerous coster burns i've ended up with no discs which actually run. THe game starts it displays the sega copyright screen, then it displays "TEAM ANDROMADA" wiht their logo, then the TV screen flickers and it returns to the music control screen saying disc unsuitable for this system!. HELPS , Love you all
I've got a standard issue, Sega Saturn memory cart? could that be causing problems! I shall try with much haste.
A standard Sega memory cart shouldn't cause any problems.

It's 'cheat' carts that cause problems with PDS, although it is polite enough to ask you to remove them.