Memory controller performing recovery operation, operating method of the same, and memory system including the same

A method of operating a memory controller for controlling an operation of a memory device comprising a plurality of memory cells constituting a plurality of sub-sets, the method comprising:

• transmitting a read command to the memory device;
• increasing a read count for a sub-set, among the plurality of sub-sets, corresponding to the read command;
• determining whether the read count of the sub-set satisfies a criteria;
• and
• performing a recovery operation on the sub-set based on a result of the determination that the read count of the sub-set satisfies the criteria,
• wherein the sub-set comprises a plurality of pages, and
• wherein each of the plurality of pages is a unit in which a read operation is performed in the plurality of memory cells,
• wherein the performing of the recovery operation comprises:
• determining whether the read count reaches a second reference value;
• transmitting a read command for the sub-set corresponding to the read count based on a determination that the read count reaches the second reference value;
• correcting an error in data read from the sub-set;
• and
• transmitting a rewrite command for the sub-set and the corrected data to the memory device to allow the corrected data to be rewritten to the sub-set.

A memory controller for controlling a memory device comprising a plurality of memory cells constituting a plurality of sub-sets, the memory controller comprising:

• a memory configured to store one or more instruction;
• and
• at least one processor configured to execute the one or more instructions to:
• manage, for each of the plurality of sub-sets, a read count, which indicates a number of read commands transmitted to the memory device for the respective sub-set among the plurality of sub-sets,
• identify a sub-set, among the plurality of sub-sets, which has the read count satisfying a criteria, output an instruction to perform a recovery operation the identified sub-set,
• wherein each of the plurality of sub-sets comprises a plurality of pages, and
• wherein each of the plurality of pages is a unit in which a read operation is performed in the plurality of memory cells,
• wherein the at least one processor is further configured to:
• transmit a recovery command to the memory device such that a recovery pulse is provided to the sub-set corresponding to the read count, based on a result of the determination that the read count reaches a first reference value, and
• transmit a rewrite command such that data is rewritten in the sub-set, when the read count reaches a second reference value, and wherein the first reference value is less than the second reference value, and
• wherein memory cells connected to the same word line among the plurality of memory cells are included in the same sub-set.