Memory device, and memory system and operation method thereof

A memory system, comprising:

• a memory device comprising:
• a plurality of word lines, wherein a plurality of strings coupled to each of the word lines are divided into a first string area and a second string area, wherein the first string area and the second string area coupled to each of the word lines are located in different blocks, respectively;
• and
• at least one redundant stripe corresponding to each of the word lines, wherein the redundant stripe comprises a first redundant stripe which is configured to store first check data, wherein the first check data is obtainable by performing error correction coding on data in a first string area of a word line where the first redundant stripe is located and data in a second string area of a word line adjacent to the word line where the first redundant stripe is located;
• and
• a memory controller coupled to the memory device and configured to:
• when a plurality of data errors occur in a plurality of strings coupled to one of the word lines, perform correction by using the first check data stored in a redundant stripe corresponding to a corresponding word line and the first check data stored in a redundant stripe corresponding to a word line adjacent to the corresponding word line.