Flash memory Device Error Correction Code Controllers and Related Methods and Memory Systems

A method for correcting data errors, the method comprising:

• receiving first data that is to be stored in a flash memory device;
• generating first error correction code (ECC) data for the first data using a first error correction scheme;
• generating second error correction code (ECC) data for the first data using a second error correction scheme;
• storing the first data, the first ECC data, and the second ECC in the flash memory device;
• reading the first data from the flash memory device;
• determining the number of errors in the read first data;
• and
• correcting the errors in the first data using one of the first ECC data or the second ECC data selectively based on -the determined number of the errors.

A method for correcting errors in data that is stored in a flash memory device, the method comprising:

• reading the data along with first error correction code (ECC) data and second ECC data from the flash memory device;
• determining a number of errors in the read data;
• and
• selecting one of the first ECC data or the second ECC data for use in correcting the errors in the read data based on the determined number of the errors.

A memory system comprising:

• a flash memory device that is configured to store M-bit data, M being a positive integer equal to or greater than 2;
• and
• a memory controller that is configured to control the flash memory device, the memory controller comprising:
• an encoder that is configured to generate first ECC data in response to input data that is to be stored in the flash memory device by using a first error correction scheme and that is configured to generate second ECC data in response to the input data by using a second error correction scheme, the input data, the first ECC data, and the second ECC data being stored in the flash memory device;
• and
• a decoder that is configured to calculate the number of errors in data read from the flash memory device and to correct the errors in the read data using one of the first ECC data or the second ECC data selectively according to the number of errors.