I wanted to buythe 250g HDD for XBOX 360. I understand there are two different consoles and they take different drives. No problem so far. I have the original 360 not the 360 S. I have discovered there are two different model numbers of the 250g drive that fit the original machine. The pics and specs appear to be the same but the price of the one is consistently about half the price of the other at different locations on the net. Tiger has them both, same description , different price. What is the real difference here? I can't seem to find out.