Provided is a storage device that includes a first interface unit configured to connect to an external apparatus, a second interface unit configured to connect to a network, and a control unit which control the storage device. The control unit determines whether the external apparatus is connected to the first interface unit. The control unit selects a first operating mode where the storage device is used by the external apparatus and the second interface unit is disabled, if the control units determines that the external apparatus is connected to the first interface unit. The control unit selects a second operating mode where the storage device operates as a file server and the second interface is enabled, if the control unit determines that the external apparatus is not connected to the first interface unit.

 
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