Kioxia Corporation

Kyoka Konishi

Yasuyuki Ushijima

Hisaki Niikura

Eriko Akaihata

According to one embodiment, each time the number of program/erase cycles of a block increases by a first number of times, a controller of a memory system measures the number of error bits of data read from a plurality of memory cells connected to each of a plurality of word lines. The controller identifies a word line group including a word line corresponding to the number of error bits which is greater than a threshold. The controller selects, based on an average number of error bits of the identified word line group, a parameter set to be applied to the identified word line group from a plurality of parameter sets. The controller changes, to the selected parameter set, a parameter set defining a program operation for the identified word line group.

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Yokohama Kanagawa, Japan

Kyoka Konishi