Patent ID: 11914885
Assignee: SK HYNIX INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 14:
15. A method of operating a memory controller controlling a memory device with memory cells that are included in a plurality of strings, respectively, the method comprising:
detecting a state of the memory device;
selecting neighboring strings that are adjacent to a string that comprises a memory cell, among the memory cells, on which a program operation or a read operation was performed, based on an idle state of the memory device;
selecting memory cells that are included in at least one word line as monitoring memory cells, wherein the memory cells are a part of the neighboring strings;
outputting a program command to perform a plurality of loops to program the monitoring memory cells; and
selecting a memory block with the monitoring memory cells as a bad block based on a rate of increase in threshold voltage of a threshold voltage distribution of the monitoring memory cells.