Memory Device and Memory System capable of over-writing and Operating Method thereof

The over-the method of operation of the memory device, the memory system and the memory system write is started. Method of operating a memory system according to the technical features of the present invention, comprising the steps of: receiving a logical address and data to at least one write request and, correspondingly, the received write request, as a result of analyzing at least one of a logical address and data a based on the phase and the comparison result of comparing the threshold value, the time be provided the step of writing the data, select the first updating method according to the first updating method or the second updating method, pre-stored address mapping information in accordance with and the data is recorded in an area where the physical address corresponding to the logical address indicated, when the second update method is selected, the information of the physical address corresponding to the logical address is changed, the changed physical address characterized in that the data is recorded in an area indicating do.