The PS3 can not save on the game disc because it does not write to Blu-Ray disc. It is a game, DVD, Cd, and Blu-Ray disc player and does not have the ability to make changes to discs of any type.
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on the ps3 console in the front their is a button it will take the disk out
Yes, usually an old PS3 disk should work on a new PS3 console.
No the game is not backwards compatible with any PS3 console
click on the save button!
The most powerful game system right now, in terms of the best hardware, is the PS3.