Usb 2.0 and esata combo max speed

What is the speed of usb 2.0 and esata combo. I am getting almost same speed on combo as well as seprate usb 2.0 port with External HDD as well pendrive 3.0.
I am getting speed aorund 105 MBPS in begning. Sometimes it sustain around 60 MBPS while most of the time goes down to 30 MBPS.

System Configuration
Lenovo Ideapad Z570 (2012 model)
8GB RAM
Core i5 2.4 GHz
HDD 750GB

Answer

Attribution
Source : Link , Question Author : ram619 , Answer Author : Community

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