Memory system

A memory controller of a memory system including a non-volatile memory having a first area and a second area each containing a plurality of blocks, wherein the memory controller is electrically connected to the non-volatile memory and configured to perform a write operation on the non-volatile memory in response to a write command from a host by:

• writing system data in a first mode to a first block of the first area, the first mode being a write mode for writing data with a first number of bits per memory cell;
• writing user data in the first mode to a second block of the first area when the write command is of a first type;
• and
• writing user data in a second mode to a third block of the second area when the write command is of a second type,
• wherein the second mode is a write mode for writing data with a second number of bits per memory cell, the second number of bits being larger than the first number of bits, and
• wherein the memory controller is further configured to determine that data to be written is the system data or the user data based on identification information added to the write command, and to write the identification information along with the system data or the user data at a column address that is consecutive to that of the system data or the user data.

A method of executing a write operation in a memory system in response to a write command from a host, wherein the memory system includes a non-volatile memory having a first area and a second area each containing a plurality of blocks, said method comprising:

• determining that data to be written is system data or user data based on identification information added to the write command;
• writing the system data in a first mode to a first block of the first area, the first mode being a write mode for writing data with a first number of bits per memory cell;
• writing the user data in the first mode to a second block of the first area when the write command is of a first type;
• writing the user data in a second mode to a third block of the second area when the write command is of a second type;
• and
• writing the identification information along with the system data or the user data at a column address that is consecutive to that of the system data or the user data,
• wherein the second mode is a write mode for writing data with a second number of bits per memory cell, the second number of bits being larger than the first number of bits.