Hi, I'm wondering that the USB 2.0 have a transfer speed at 480 MB/s but why mine can only transfers at around 30-40 MB/s? The devices I'm using are supported the USB 2.0 (High speed) and one even support 3.0! Is there anything wrong with my Mac or is there a way to speed it up? Thanks in advances, Nathan. PS. I'm using a late 2008 Aluminum Unibody MacBook model.