Data storage device including nonvolatile memory device and operating method thereof

A method of operating a data storage device, the data storage device including a three-dimensional nonvolatile memory device having a plurality of memory blocks and a memory controller configured to control the three-dimensional nonvolatile memory device, the method comprising:

• programming N memory blocks with dummy data,
• the N memory blocks, before being programmed with the dummy data, being are not fully programmed with user data, dummy data, or the user and dummy data, from among the memory blocks,
• at a point in time when a reference time elapses from a point in time when each of the first memory blocks is physically erased,
• N being an integer greater than 1 and less than a number of the plurality of memory blocks in the three-dimensional nonvolatile memory device;
• acquiring an interval during which a fully programmed state is maintained after each of the N memory blocks is fully programmed;
• selecting a victim block for garbage collection among the N memory blocks in which the interval when the fully programmed state is maintained exceeds a threshold time;
• and
• copying valid page data from the victim block into a free block.

A method of operating a data storage device, the data storage device including a nonvolatile memory device and a controller configured to control the nonvolatile memory device, the nonvolatile memory device including a plurality of memory blocks on a substrate, the method comprising:

• performing a dummy closing operation on N memory blocks that are not fully programmed among the plurality of memory blocks,
• N being an integer greater than 1 and less than a number of the plurality of memory blocks,
• the dummy closing operation including programming the N memory blocks with dummy data at respective times corresponding to first intervals after respective erase times for each of the N memory blocks;
• selecting a victim block among the N memory blocks based on one of a second interval and a disturb index for each of the N memory blocks,
• the second intervals corresponding to respective times in which each of the N memory blocks is maintained in a fully-programmed state after the performing the dummy closing operation,
• the disturb index being calculated by the controller for each of the N memory blocks based on the first and second intervals of the N memory blocks;
• and
• performing garbage collection on the victim block, the garbage collection including copying valid page data of the victim block into a free block among the memory blocks.