I've got two external hard drive enclosures with USB 3.0 interface. I also have several WD external drives with USB 2.0 interface. My speeds vary a little bit, but the USB 2.0 gets about 20 kB/sec while the USB 3.0 goes at about 200 kB/sec
. I've got USB 3.0 integrated into my motherboard.
While Thunderbolt does blow USB 3.0 away as far as data transfer speeds, I still see USB 3.0 as a helpful interface. With all the USB 2.0 devices already in existence, computer makers will likely continue to provide a USB interface. Since USB 3.0 is backwards-compatible, there's no reason it wouldn't become the new industry standard. And its 10 times faster - win/win situation.
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