Storage device having a plurality of interfaces for connection to an external device

1. A storage device comprising:

a plurality of interfaces for connection to an external device;

a storage unit that stores data;

an effective interface setting unit that sets one of the plurality of interfaces as an effective interface that may access the storage unit; and

a switching instruction receiving unit that receives an effective interface switching instruction during operation of the storage device,

wherein the effective interface setting unit switches the interface set as the effective interface based on the effective interface switching instruction,

wherein one of the plurality of interfaces is a network interface for connection to a network, the storage device further comprises a file sharing unit that provides a device on the network with a service for sharing a data file stored in the storage unit, and prior to switching the interface set as the effective interface from the network interface to another interface, the effective interface setting unit has the file sharing unit stop providing the service for sharing a data file.

2. The storage device in accordance with claim 1 , wherein

the effective interface setting unit opens a data transfer path between the storage unit and one of the plurality of interfaces that is to be set as the effective interface, and closes a data transfer path between the storage unit and the other interfaces.

3. The storage device in accordance with claim 2 , wherein

the plurality of interfaces are interfaces of mutually different type.

4. The storage device in accordance with claim 3 , wherein

the plurality of interfaces include a USB interface and a LAN interface.

5. The storage device in accordance with claim 1 , wherein

the plurality of interfaces are interfaces of mutually different type.

6. The storage device in accordance with claim 5 , wherein

the plurality of interfaces include a USB interface and a LAN interface.