so i just got my ps3 a few days ago, and couldnt be happier. but my friend was telling me about how i could replace the hdd with a much MUCH larger one, as apposed to the 20 gb. saying that i could but a 600 gb hdd in the thing. is this true? and if so, how would i know if the hdd i get would be able to fit or be compatable with my ps3?