A device for writing data into a memory and a method thereof. The memory comprises a plurality of memory arrays. Each of the memory arrays comprises a plurality of memory cells. The data is divided into a plurality of segments. The segments are written into first memory cells of the memory cells of the memory arrays in sequence. The segments are written into second memory cells of the memory cells of the memory arrays when the first memory cells of the memory cells of the memory arrays are full, and so forth till the operation of writing the segments into the memory is completed.