Non-volatile memory device, storage device, operating method of storage controller, and operating method of the storage device

Abstract

In some embodiments, an operating method of a storage device includes obtaining a plurality of points by searching for a first valley point between threshold voltage distributions of selection memory cells coupled to a selection word line of a plurality of word lines; calculating, using a first function, a first voltage level that corresponds to a first reference count value; calculating, using a second function, a second voltage level that corresponds to the first reference count value; classifying the selection memory cells into a plurality of coupling patterns according to an aggressor cell group of each of adjacent memory cells coupled to at least one adjacent word line adjacent to the selection word line; and performing a read operation, based on the plurality of coupling patterns of the selection memory cells, the first voltage level, and the second voltage level.