Patent ID: 8909959

Claim:
A voltage adjustment circuit for a storage medium, comprising: a storage medium interface connecting to the storage medium and comprising a first and a second signal pins; a storage medium control chip comprising a third and a fourth signal pins, wherein the third and the fourth signal pins transmit a pair of differential signal to the first and the second signal pins when the storage medium is read/written to by the storage medium control chip; and a switch module connecting to a power supply unit and the storage medium interface, and comprising a first terminal, wherein the first terminal is connected to the third and the fourth signal pins and a direct current (DC) power unit for receiving one of a low level signal obtained from the pair of differential signal and a high level signal of the DC power unit, and wherein the power supply unit is controlled by the switch module to supply power to the storage medium interface when the first terminal receives the low level signal, and the power supply unit stops supplying power to the storage medium interface by the switch module when the first terminal receives the high level signal.