So I decided I'm finally going to put an 480GB SSD in my old 2008 unibody aluminum Macbook to replace the 320GB HDD. I plan to get an external SATA to USB2 enclosure. I know how to replace the drive inside the machine and put the old one in the enclosure, the part that I don't know is how to copy my current drive to the new SSD since it won't have an OS on it when I put it in the machine. How do I do this? I like my machine as it is now, I just want a faster drive with more capacity but everything else to remain the same.