I have seen no current machines that use the old PATA for drives. You may have to find machines prior to 2005 to have to worry if it's not SATA.
I just bought (10/25/10) a Dell Alienware Area-51 computer and I want to add a second DVD burner. I do not know what type of wiring connectors that it has. I know that it is not SATA. Mine has much smaller "mini" connectors. Could it be PATA?? I'm completely ignorant on the subject. Thanks . . . Jim