My Girlfriend has a 2.6Ghz Early 2008 15" MacBook Pro w/ a 2.6Ghz Core2Duo. Her hard drive is starting to click. It's the stock 160GB 5400RPM HDD. I'm on NewEgg and the selection of SATA 1 drives is VERY LOW but that's what kind of drive she has. Tech specs for her machine show only SATA1 as the interface type. Can I buy SATA 2 drives on Newegg (since they're cheaper w/ more selection) and will it just down clock itself and work or will it not work?