Hello I recently ordered a Macbook Pro, 13,3"; I haven't recieved it yet, as total delivery is 10 days. I bought it with a 320 GB HDD as it was the most economical upgrade (the 500 GB is a ripoff), but just read that changing the HDD voids the warrenty. Is that true? Is it visible, should it ever need servicing? I bought the Apple Care, so it makes a big difference. If I buy an external HDD, boot from that, and use it for gaming, will it severely hamper performance? I know running an external drive isn't nearly as fast as an internal, but would that be a bottle neck with gaming? I should also note, that gaming is a small pastime, not something I will be doing a lot. Thank you very much.