1. A storage device comprising: a control unit that performs processing for communication with a host device; a storage unit to which write data included in a write data packet that is transmitted from the host device is to be written; and a storage control unit that performs access control on the storage unit, wherein the control unit receives the write data packet from the host device, in a case where a data pattern constituted by the write data and additional data that are included in the write data packet is judged as not matching a specific pattern, along with making an update instruction of address information, makes a write instruction regarding the write data to the storage control unit, and in a case where the data pattern constituted by the write data and the additional data is judged as matching the specific pattern, does not make a write instruction regarding the write data, but makes an update instruction of the address information to the storage control unit, the additional data is data for error checking of the write data, and the specific pattern is data that is to be judged as an error in the error checking.