Data storage device and operating method thereof

A data storage device comprising:

• a nonvolatile memory apparatus including a plurality of first regions corresponding to a first hash value and a plurality of second regions corresponding to a second hash value;
• and
• a processor suitable for managing a first common access count corresponding to the plurality of first regions and a second common access count corresponding to the plurality of second regions,
• wherein the first common access count is indexed by the first hash value and the second common access count is indexed by the second hash value,
• wherein the first regions and the second regions include a target region commonly, and
• wherein the first regions include one or more regions which are not included in the second regions, and the second regions include one or more regions which are not included in the first regions.

A method for operating a data storage device, comprising:

• in response to a read command, accessing a target region included in a nonvolatile memory apparatus;
• increasing a first access count and a second access count after the accessing of the target region, the first access count corresponding to a plurality of first regions including the target region, the second access count corresponding to a plurality of second regions including the target region;
• performing a data inspection operation on a region related to the target region when any one of the access counts reaches a threshold,
• wherein the first regions include one or more regions which are not included in the second regions, and the second regions include one or more regions which are not included in the first regions.