The present invention is to provide a thin data storage device with a support pad's length positioned at a USB port's height in a way for a supporting segment securely supported and a USB metal contact effectively and electrically connected to a female connector of the USB port without problems such as invalid electrical connection or poor contact between a USB metal contact and a female connector of a computer's USB port affected by the integrated circuit module's thinned thickness. Relying on the lowered thickness of the integrated circuit module, the present invention is effective in extensive applications to other products.