In my macbook pro, I have a 128GB SSD. My music and photos are too large to fit on the SSD. I currently have an external hard drive that is almost always connected to my mac that holds my music, pictures, and movies folder (I set up symbolic links). This hard drive is connected via Firewire 800. I am looking to get a more portable hard drive. The hard drives I am looking at are connected via USB 3.0/2.0. My mac doesn't have USB 3.0, so it would use USB 2.0. Would I notice a difference in speed when accessing the data from my hard drive using the USB 2.0 hard drive instead of a firewire 800 hard drive? Also, I think that more portable hard drive is 5400 RPM, whereas my firewire hard drive is 7200 RPM. Would this also affect speeds when accessing data? I am not too worried about backing up or transferring data because I usually transfer small files, i'm just worried about the speeds when accessing data.