A memory system is provided. The memory system includes a memory controller and a first memory block. The first memory block is configured to store a first data from a top of the first memory block in a top-down fashion. The first memory block is configured to store a first metadata corresponding to the first data from a bottom of the first memory block in a bottom-up fashion. The first data forms a first data area. The first metadata forms a first metadata area. And a first continuous space is formed between a bottom of the first data area and a top of the first metadata area.