A data storage device includes a nonvolatile memory device including a plurality of memory blocks each of which includes a plurality of regions; and a controller suitable for controlling the nonvolatile memory device, the controller comprising: a block designation unit suitable for performing a level 2 designation operation, by storing start data in a level 2 management block among the memory blocks, storing a location of the level 2 management block in a level 1 management block among the memory blocks, and storing integrity check data in the level 2 management block; and a recovery unit suitable for performing a recovery operation to the level 1 management block depending on a state of a current level 2 management block corresponding to a last location stored in the level 1 management block in the case where a sudden power-off occurs.