Help with Burning psx 1 games!

[fxpman]

just purchase a psx and it has a mod chip .. i tried some games some one burned for me and it works great,, now here is the issue i dl some games and then i burned them.. i used cdrwin ,,but when i try the game in psx it says eather plz insert format disk or it would not do anything .. these games have been ripped by a release group ,,what could be wrong or what might be the prob? thanks guy,s!!