It is a CTO machine, where is the sale specs ? You say It has 2 usb ports on left and one on right. Sounds like
on the right side, your machine has one USB 2.0 port which is for Connects a USB device, such as a cell phone, camera, activity tracker, or smartwatch, and provides data transfer.
on the left side, your machine has 2 USB 3.0 ports which are for Connect a USB device, such as a cell phone, camera, activity tracker, or smartwatch, and provide high-speed data transfer. (same as USB 2.0 but faster).
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