Either a CD-R or a CD-RW. The first you cannot delete or write over but the second, RW, is rewritable so you can.
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No the PS3 does not Burn Discs and is a Player only and not a writer. There is no way to do it, you need to to it on your PC.
Game Discs are not writable Discs that take changes or edits
It's primarily an online-only game, so the only way to have a copy of Roblox is to download it or have a copy of the installer somewhere (which would download the game anyways).
Usually stores like Game Crazy and the Radio Shack Repair Center offer to buffer discs, but buffering is for scratches in discs, I'm not sure if it can fix a crack.
Gamestop will clean some xBox 360 game discs.