Patent ID: 8245275

Claim:
An electronic device connected or disposed with an external storage medium, the electronic device comprising: a connector unit that is connected to an external device; a transmission channel that is connected to the connector unit to transmit data from the external device; a data processing unit that is connected to the transmission channel; and a data transferring unit that is connected to the transmission channel, the data transferring unit including a switching function allowing or blocking passage of the data transmitted from the transmission channel, so as in case of writing the data into the external storage medium, the data transferring unit sending a disconnection request to the data processing unit, the disconnection request being for blocking input of the data by making a port of the data processing unit high impedance, and after receiving a disconnection notification from the data processing unit, the data transferring unit allowing passage of the data transmitted from the transmission channel to transfer the data to the external storage medium, wherein the data transferring unit receives a notification that the external device is connected to the connector unit, and generates an inquiry representing whether the data are input to the data processing unit or input to the data transferring unit, based on the notification that the external device is connected to the connector unit, and the data transferring unit allows the passage of the data while the data processing unit is disconnected from the transmission channel and the external device.