STORAGE DEVICE AND METHOD OF OPERATING STORAGE DEVICE

A memory device includes a non-volatile memory device and a memory controller configured to control the non-volatile memory device. The nonvolatile memory device includes a memory cell array including a plurality of word lines stacked on a substrate, a plurality of memory cells disposed in a plurality of channel holes, and a word line cutting region dividing the plurality of word lines into a plurality of memory blocks. The storage controller groups a plurality of target storage units into an external unit and an internal unit. The memory controller includes an error correction code (ECC) decoder configured to perform an ECC decoding operation by obtaining external cell bits and internal cell bits during a read operation on a plurality of target memory cells, and applying different log-likelihood ratio (LLR) values to the external cell bits and the internal cell bits. 一种存储设备，包括非易失性存储器件和被配置为控制非易失性存储器件的存储控制器。非易失性存储器件包括存储单元阵列，该存储单元阵列包括堆叠在衬底上的多条字线、设置在多个沟道孔中的多个存储单元、以及将多条字线划分为多个存储块的字线切割区。存储控制器将多个目标存储单元分组为外部单元和内部单元。