Storage controller, operation method thereof

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

• reading sub-stripe data from each of a plurality of non-volatile memory devices connected with a Redundant Array of Inexpensive Disk (RAID);
• checking error information of the read sub-stripe data to check an existence of an uncorrectable error;
• increasing a failure count value and reading next sub-stripe data, in response to the error information indicating the read sub-stripe data has an error;
• and
• performing an XOR calculation by the read sub-stripe data in response to the read sub-stripe data not having the error,
• resetting the failure count value and re-reading the sub-stripe data stored in each of the plurality of non-volatile memory devices, in response to the failure count value exceeding a number of parity sub-stripes,
• wherein the error information is stored as a header or basic information of the sub-stripe data.

A storage controller comprising:

• a Direct Memory Access (DMA) interface connected to a plurality of non-volatile memory devices, the DMA interface configured to transmit and receive sub-stripe data to and from each of the non-volatile memory devices;
• and
• processing circuitry configured to
• check error information of the sub-stripe data, the error information being stored as a header or basic information of the sub-stripe data, and
• perform an XOR calculation on the basis of the error information indicating the sub-stripe data has no uncorrectable error to extract recovery data,
• wherein the processing circuitry is configured to re-read the sub-stripe data having the uncorrectable error and perform first error decoding, and performs the XOR calculation on the basis of the sub-stripe data to extract recovery data in response to the uncorrectable error being corrected, and
• wherein the processing circuitry is configured to extract the recovery data in response to the error information indicating a number of the sub-stripe data has the uncorrectable error and the number of the sub-stripe data having the uncorrectable error being less than or equal to a number of parity sub-stripes.