Resolved USB 3 device in USB 2 device not running at full speed?

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i have usb 3 external hard disk. when connected mac usb 3 port, hard disk runs @ speeds ~100mb/s of read , write. on older mbp usb 2 ports, runs @ ~30mb/s r/w. maximum speed of usb 2 60mb/s, why running half?
 

usb3 directional, usb2 simplex... usb3 protocol more efficient when storage handling data.... bunch of things including old mbp hardware.
 


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