WHAT IS A FORMAT DISC I CANT PLAY MY GAME

Eric New member Username: Vietsniper2 Post Number: 1 Registered: Apr-10	Posted on Sunday, April 25, 2010 - 19:25 GMT can anyone help me cause im trying to play final fantasy x and it says that i have to put in a format disc what is that anyway!!!!!!!!!!!!!
sean Platinum Member Username: Insearchofbass Post Number: 16413 Registered: Jun-04	Posted on Friday, December 24, 2010 - 18:01 GMT i think that game was sold with a hard drive