Please note that USB 2.0 is only for power supply, not for data transmission through USB 2.0 port.
The cable can connect a 2.5 -inch SATA hard drive directly to the eSATA interface.
The hard drive is powered by the computer' s USB interface.
First connect the SATA connector to the 2.5 -inch SATA hard drive socket and the eSATA connector to the eSATA connector on the computer.
Then connect the USB connector to the USB port on the computer.