Semiconductor memory device including non-volatile memory, cache memory, and computer system

A method of reading data, comprising:

• receiving a request to read data from one of a first number of data blocks;
• reading the requested data block in response to the request;
• determining from block identification information if one of a second number of ECC blocks is associated with the requested data block, the second number being less than the first number;
• and
• if one of the second number of ECC blocks is associated with the requested data block,
• reading the associated ECC block;
• and
• performing error correction on the read data block using the read ECC block.

A method of storing data, comprising:

• receiving a request to write received data to a selected one of a first number of data blocks;
• determining if an invalid error correction (ECC) block in a second number of ECC blocks exists in response to the request, the second number of data blocks being associated with the first number of data blocks;
• and
• if an invalid ECC block does not exist,
• removing errors from data in another of the first number of data blocks such that no errors in reading the another data block exist;
• invalidating the ECC block associated with the another data;
• writing the received data in the selected data block;
• writing ECC data associated with the received data into the invalidated ECC block;
• and
• changing a state of the invalidated ECC block to valid.

A method of storing data, comprising:

• receiving a request to write received data to a selected one of a first number of data blocks;
• writing the received data to the selected data block;
• writing ECC data associated with the received data to one of a second number of ECC blocks;
• determining if the written data includes errors that are not correctable by the ECC data;
• and
• correcting at least one of the errors in the written data if the errors are determined not to be correctable.