There is no current 500GB drive available. The highest GB currently is 400 and that was released not too long ago. But I figure with the capacity wars that seem to be going on you might only have to wait a few months before one is released.

But its going to be spendy when one finally does come out!

A half terrabyte HD. Could you imagine a drive failure!

EDIT: Well, I was wrong. Eh, least its not actually out yet.