Patent ID: 8908431
Filing Date: 2014-12-09
Classification: G11C,H01L

Abstract:
1. A control method of a nonvolatile memory device, which includes a plurality of memory blocks on a substrate, each memory block including a plurality of strings arranged in rows and columns on the substrate, each string including at least one first select transistor, a plurality of memory cells and at least one second select transistor sequentially stacked on the substrate in a direction perpendicular to the substrate, memory cells of each memory block being divided into sub blocks, the control method comprising: comparing a count value of a first memory block of the plurality of memory blocks with a reference value, the count value of the first memory block being determined according to a number of program, read, or erase operations executed on the first memory block after data is programmed in the first memory block; and if the count value of the first memory block is equal to or more than the reference value, performing a reprogram operation in which data programmed in the first memory block is read and the read data is programmed in a second memory block of the plurality of memory blocks.