MEMORY SYSTEM AND OPERATING METHOD THEREOF

Embodiments of the present disclosure relate to a memory system and an operating method thereof. According to exemplary embodiments of the present disclosure, the memory system may store information on a number of error bits generated in a first read operation in an error bit history set, when the number of error bits generated in the first read operation for a first memory block among the plurality of memory blocks is greater than or equal to a first io threshold and less than a second threshold, and may repeat, during a read operation performed after the first read operation for the first memory block, an operation of calibrating a history read bias corresponding to the first memory block until a set termination condition is satisfied.