Nonvolatile memory device, operating method thereof and data storage device including the same

A method for operating a nonvolatile memory device, comprising:

• receiving a fail occurrence command from an external device;
• storing fail occurrence information in a fail occurrence register based on the fail occurrence command;
• receiving a test operation command from the external device;
• performing a test operation corresponding to the test operation command;
• checking the fail occurrence information;
• and
• causing a fail to occur for the test operation, based on the fail occurrence information.

A data storage device including a nonvolatile memory device and a controller which controls an operation of the nonvolatile memory device, the nonvolatile memory device comprising:

• a memory cell array;
• a peripheral circuit configured to perform an operation corresponding to a command provided from an external device, for the memory cell array;
• a fail occurrence register configured to store fail occurrence information for intentionally causing an operation fail to occur;
• and
• a control logic configured to:
• store the fail occurrence information in the fail occurrence register based on a fail occurrence command received from the controller;
• control the peripheral circuit to perform a test operation corresponding to a test operation command received from the controller, for the memory cell array;
• and
• control the peripheral circuit to cause an intentional fail to occur in the test operation, based on the fail occurrence information.