A semiconductor device includes a substrate having a serial advanced technology attachment (SATA) connector that has a plurality of power supply terminals and a plurality of signal terminals, a nonvolatile semiconductor memory unit disposed on the substrate, and a memory control circuit disposed on the substrate, configured to control the nonvolatile semiconductor memory unit, and having a data input terminal connected to a first power supply terminal of the SATA connector and a data output terminal connected to a second power supply terminal of the SATA connector. A serial signal of input data is transmitted from the first power supply terminal to the data input terminal, and a serial signal of output data is transmitted from the data output terminal to the second power supply terminal.
