Recording device and recording and reproducing device

A recording device for recording data on a recording medium, comprising:

• a read/write module which reads and writes data on a recording medium, said read/write module having electric power being supplied by an external power source;
• a battery-built-in clock which as a built-in battery and a clock function;
• an input/output interface for inputting data from outside and outputting data to outside;
• and
• a controller for controlling said read/write module and said input/output interface,
• wherein said recording medium includes an ordinary data area for writing ordinary data and an expiration time data area for writing an expiration time of said ordinary data, and wherein said controller performs control to alter ordinary data and output altered ordinary data written in said ordinary data area when said expiration time written in said expiration time data area has passed a time limit calculated by the clock function of said battery-built-in clock.