Memory system and method

Abstract

To realize a memory system capable of reducing the size of data that needs to be held. In one embodiment, a controller of a memory system executes a third program operation on memory cells connected to a k-th word line of a first string unit after executing a first write operation on memory cells of a first string unit. The controller executes a second write operation on memory cells connected to a second string unit. After executing the third program operation on memory cells connected to the k-th word line of the second string unit and the second program operation on memory cells connected to the (k-1)-th word line of the second string unit, the controller executes a fourth program operation on memory cells connected to the k-th word line of the first string unit.

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