Memory system for securing reliability and operating method thereof

Abstract

A memory system comprising: a non-volatile memory device including K word lines, and a controller suitable for: selecting maximum N word lines in order from highest ones among counted numbers of times that a read retry operation is performed respectively on the K word lines, managing the selected word lines as first word lines, selecting, as target word lines among the K word lines for each predetermined period, second word lines satisfying a sampling condition and third word lines having the counted number of times exceeding a reference number of times among the first word lines, and performing, without a read request from a host, a media scan operation for checking whether an error occurs in the target word lines, where N is a natural number equal to or greater than 1 and less than or equal to K, and K is a natural number equal to or greater than 2.

Dependencies are inferred from the claim text.