A data storage device includes a memory device including a normal data region and a mapping data region, the normal data region being configured to store normal data, the mapping data region being configured to store mapping data; a host request managing device configured to manage a read/write request from a host; a mapping managing device configured to cache a part of the mapping data and to manage mapping information according to a request from the host request managing device; and a memory controller configured to manage an operation of the memory device according to a request from at least one of the host request managing device and the mapping managing device.