Data storage device and operating method thereof

A method for operating a data storage device including a nonvolatile memory device, including a plurality of memory block groups each having a first page group storing data transmitted from a host device and a second page group storing address mapping information corresponding to the data and a plurality of map data blocks, and a controller for controlling the nonvolatile memory device, the method comprising:

• comparing, when a first memory block group in which the second page group is damaged occurs among the plurality of memory block groups, the number of valid data stored in the first memory block group and available capacity of an open map data block which is being used among the plurality of map data blocks, by the controller;
• and
• controlling, when the number of the valid data stored in the first memory block group is equal to or smaller than the available capacity of the open map data block, the nonvolatile memory device by the controller to store address mapping information corresponding to the valid data of the first memory block group, in the open map data block.

A data storage device comprising:

• a memory device including first to third memory blocks;
• and
• a controller configured to control the memory device, when the first memory block is damaged, to move one or more physical-to-logical (P2L) address entries of the first memory block into the second memory block when the second memory block has available capacity equal to or greater than the size of the P2L address entries, and into the third memory block when the second memory block has available capacity less than the size of the P2L address entries.