A data storing method for a storage apparatus. The storage apparatus has a memory block, which includes a first terminal and a second terminal. The data storing method includes receiving a data set; selecting a first writing direction or a second writing direction to be a preferred writing direction, wherein when the first writing direction is selected to be the preferred writing direction, the first terminal is a starting point corresponding to the first writing direction, and when the second writing direction is selected to be the preferred writing direction, the second terminal is a starting point corresponding to the second writing direction; and writing the data set into the memory block according to the selected writing direction.