Controller, information processing system, method of controlling controller, and program

An information processing system comprising:

• a controller configured to read a code word from a storage section and execute low-level error correction in which an error in the code word is corrected with use of a predetermined decoding algorithm;
• and
• a host computer configured to execute high-level soft-decision error correction in which the error in the code word is corrected with use of a high-level algorithm when the error correction by the controller has failed, the high-level algorithm being a soft-decision decoding algorithm having higher error correction capability than error correction capability of the predetermined decoding algorithm.

A method of controlling a controller, the method comprising:

• executing low-level error correction in which an error in a code word is corrected with use of a predetermined decoding algorithm;
• and
• executing high-level soft-decision error correction in which the error in the code word is corrected with use of a high-level algorithm when the error correction in the low-level error correction has failed, the high-level algorithm being a soft-decision algorithm having higher error correction capability than error correction capability of the predetermined decoding algorithm.

A non-transitory tangible recording medium having a program embodied therein, the computer-readable program allowing, when executed by a computer, the computer to implement a method, the method comprising:

• executing low-level error correction in which an error in a code word is corrected with use of a predetermined decoding algorithm;
• and
• executing high-level soft-decision error correction in which the error in the code word is corrected with use of a high-level algorithm when the error correction in the low-level error correction has failed, the high-level algorithm being a soft-decision algorithm having higher error correction capability than error correction capability of the predetermined decoding algorithm.