Here are the CrystalDiskMark numbers of a USB 2.0 portable drive (Samsung G2 Portable 640GB):
and a USB 3.0 portable drive (Seagate Expansion 750GB):
So although the theoretical bandwidth of the USB 3.0 interface is much higher compared to USB 2.0 (48MB/s vs 480MB/s), it is limited by the throughput of the mechanical hard drive. So at best you are looking at a 2x throughput improvement when moving to USB 3.0 for mechanical disks.
and a USB 3.0 portable drive (Seagate Expansion 750GB):
So although the theoretical bandwidth of the USB 3.0 interface is much higher compared to USB 2.0 (48MB/s vs 480MB/s), it is limited by the throughput of the mechanical hard drive. So at best you are looking at a 2x throughput improvement when moving to USB 3.0 for mechanical disks.
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