I have just bought the Seagate 750gb external hard drive. I've plugged it in and connected it to my macbook using a USB but I see that there is something called 'autorun' on it. Do I need to run this to install hard drive first, as when I click on it it asks me what to open it with and I'm not sure what I should select. Somehow I think I've deleted the preference to the program that should be used to open stuff like this so I would be very grateful if somebody could please tell me which program i should be. Thanks a million!