Data processing device

A data processing system comprising:

• a first data processing device;
• and
• at least one second data processing device, wherein
• the first data processing device and the at least one second data processing device respectively serve as one of plural same-ID data processing devices,
• the first data processing device includes:
• a first communicator receiving, from a data overwriter, first device-specific information that identifies one of the plural same-ID data processing devices as a data overwrite object device, data in the data overwrite object device being overwritten by the data overwriter;
• a first device-specific information generator generating second device-specific information that is used for a determination of whether a subject data processing device is the data overwrite object device;
• a second communicator receiving, from the second data processing device, third device-specific information that is used for a determination of whether the second data processing device is the data overwrite object device;
• and
• a specifier specifying that one of the plural same-ID data processing devices is the data overwrite object device based on a matching between (a) the first device-specific information received from the data overwriter by the first communicator and (b) (i) the second device-specific information generated by the device-specific information generator or (ii) the third device-specific information received from the second data processing device by the second communicator, and
• the second data processing device includes:
• a second device-specific information generator generating the third device-specific information that is used for a determination of whether the second data processing device is the data overwrite object device;
• and
• a third communicator transmitting, to the first data processing device, the third device-specific information generated by the second device-specific information generator.