A storage system, comprising a data port, the data port comprising a data output unit, the data output unit comprising: a pull-up unit, having a control terminal, a first terminal and a second terminal, a first input signal being inputted to the control terminal, the first terminal being electrically connected to a power supply (VDDQ), the second terminal being connected to an output terminal of the data output unit; and a pull-down unit, having a control terminal, a first terminal and a second terminal, a second input signal being inputted to the control terminal, the first terminal being electrically connected to a ground terminal, and the second terminal being connected to the output terminal of the data output unit; wherein the pull-up unit is a first NMOS transistor and the pull-down unit is a second NMOS transistor; characterised in that the data output unit further comprises a first switch unit and a second switch unit, the first terminal of the pull-up unit is electrically connected to the power supply (VDDQ) through the first switch unit, and the first terminal of the pull-down unit is electrically connected to the ground terminal through the second switch unit; wherein the first switch unit is a first transistor, the first transistor comprises a control terminal, a first terminal and a second terminal, an enable signal is inputted to the control terminal, the first terminal is electrically connected to the power supply (VDDQ), and the second terminal is electrically connected to the first terminal of the pull-up unit; the second switch unit is a second transistor, the second transistor comprises a control terminal, a first terminal and a second terminal, the enable signal is inputted to the control terminal, the first terminal is electrically connected to the ground terminal, and the second terminal is electrically connected to the first terminal of the pull-down unit; and wherein the first transistor is a third NMOS transistor and the second transistor is a fourth NMOS transistor. a pull-up unit, having a control terminal, a first terminal and a second terminal, a first input signal being inputted to the control terminal, the first terminal being electrically connected to a power supply (VDDQ), the second terminal being connected to an output terminal of the data output unit; and a pull-down unit, having a control terminal, a first terminal and a second terminal, a second input signal being inputted to the control terminal, the first terminal being electrically connected to a ground terminal, and the second terminal being connected to the output terminal of the data output unit; wherein the pull-up unit is a first NMOS transistor and the pull-down unit is a second NMOS transistor; characterised in that the data output unit further comprises a first switch unit and a second switch unit, the first terminal of the pull-up unit is electrically connected to the power supply (VDDQ) through the first switch unit, and the first terminal of the pull-down unit is electrically connected to the ground terminal through the second switch unit; wherein the first switch unit is a first transistor, the first transistor comprises a control terminal, a first terminal and a second terminal, an enable signal is inputted to the control terminal, the first terminal is electrically connected to the power supply (VDDQ), and the second terminal is electrically connected to the first terminal of the pull-up unit; the second switch unit is a second transistor, the second transistor comprises a control terminal, a first terminal and a second terminal, the enable signal is inputted to the control terminal, the first terminal is electrically connected to the ground terminal, and the second terminal is electrically connected to the first terminal of the pull-down unit; and wherein the first transistor is a third NMOS transistor and the second transistor is a fourth NMOS transistor.