| CPC G06F 3/0619 (2013.01) [G06F 3/0655 (2013.01); G06F 3/0679 (2013.01)] | 17 Claims |
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1. 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.
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