Storage controller, storage system, and method for recovering data in host memory buffer

An operating method of a storage system including a host memory buffer and a storage device including a storage controller and a non-volatile memory device, the operating method comprising:

• reading, using the storage controller, a codeword including first data from the host memory buffer;
• performing, using the storage controller, an error detection operation and an error correction operation;
• determining, using the storage controller, that the first data includes an error uncorrectable through the error correction operation;
• reading, using the storage controller, a first redundant array of independent disks (RAID) codeword including first (RAID) parity data and a plurality of first codewords respectively including pieces of data included in subset data from the host memory buffer, based on the first data including an uncorrectable error;
• and
• recovering, by the storage controller, the first data based on the first RAID parity data and the subset data,
• wherein the subset data comprises data used along with the first data to generate the first RAID parity data.

An operating method of a storage controller, the operating method comprising:

• reading a codeword including first data from an external host memory buffer;
• performing an error detection operation and an error correction operation on the first data;
• determining that the first data includes an error uncorrectable through the error correction operation;
• reading a first redundant array of independent disks (RAID) codeword including first RAID parity data and a plurality of first codewords respectively including pieces of data included in subset data from the external host memory buffer, based on the first data including an uncorrectable error;
• and
• recovering the first data, based on the first RAID parity data and the subset data,
• wherein the subset data comprises data used along with the first data to generate the first RAID parity data.