Why is my USB3 speed slow ?

I have a T450s with a 500 gb Samsung SSD as the hard drive. I recently bought the WD 4TB USB3.0 and started copying data from hard disk to the the external WD. All usb ports on laptop are 3.0. But the average copying speed runs between 60 - 109 mb/s. I thought with a usb 3, we should run into gbps as the average... show more I have a T450s with a 500 gb Samsung SSD as the hard drive. I recently bought the WD 4TB USB3.0 and started copying data from hard disk to the the external WD. All usb ports on laptop are 3.0. But the average copying speed runs between 60 - 109 mb/s. I thought with a usb 3, we should run into gbps as the average read/write copy speed . What am i missing?
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