A memory system is disclosed. The memory system includes a memory device, a first control unit, and a second control unit. The memory device is utilized for storing data. The first control unit is coupled to the memory device for prohibiting a data writing process performed on the memory device during a writing protection period. The second control unit is coupled to the memory device for allowing the data writing process to be performed in the memory device according to a writing period after the writing protection period, wherein the writing period is related to the data writing process.