I bought a used gateway mt6840 laptop for dirt cheap off of Craiglist. And low and behold 3 weeks later the hard drive crashes. I'm in the process of getting a new hard drive, but, have some questions about the SATA connections. Can I install a hard drive with a SATA3.0 into my laptop. The one that I have in it now is a SATA1.5. I really want to buy the best hard drive possible as to not have to upgrade later. Also, assuming that I don't need the data on my old hard drive, is there anything I will need besides the Gateway system restore disk, or do I need the OS disk??