Bad block identification methods

1. A bad block identification method for a memory, the memory comprising at least one memory block for storing data, and the bad block identification method comprising:

performing a data decoding function on the data;

determining whether the data decoding function was performed successfully based on a memory block status corresponding to a previous writing operation and based on data stored in at least one data-mark location of the memory block;

in response to determination of an unsuccessful data decoding function, checking at least one predetermined location in the memory block;

determining whether the at least one predetermined location is marked by predetermined information; and

identifying the memory block as a bad block in response to a determination that the at least one predetermined location is marked by information other than the predetermined information, wherein the at least one data-mark location is different than the predetermined location.

2. The bad block identification method as claimed in claim 1 further comprising identifying the memory block as a good block if the at least one predetermined location is marked by the predetermined information.

3. The bad block identification method as claimed in claim 1 , wherein determining whether the data decoding function was performed successfully based on data stored in the at least one data-mark location of the memory block comprises:

checking the at least one data-mark location in the memory block;

determining whether the at least one data-mark location is marked by the predetermined information; and

identifying the memory block as a bad black if the at least one data-mark location is not marked by the predetermined information.

4. The bad block identification method as claimed in claim 3 further comprising:

identifying the memory block as a good block if the at least one data-mark location is marked by the predetermined information.

5. The bad block identification method as claimed in claim 3 , wherein the at least one data-mark location is the first byte of a spare area of the memory.

6. The bad block identification method as claimed in claim 1 , wherein the data decoding function performs error-correction code (ECC) decoding.

7. A method for writing data into a memory comprising a plurality of memory blocks, comprising:

identifying a first memory block among the plurality of memory blocks as a good block or a bad block, wherein identifying the first memory block comprises:

performing a data decoding function on the data;

determining whether the data decoding function was performed successfully based on a memory block status corresponding to a previous writing operation and based on data stored in at least one data-mark location of the memory block;

checking one of the data-mark location and a predetermined location in the first memory block in response to the determination result of whether the data decoding function was performed successfully;

identifying the first memory block as a good block if the checked location is marked by predetermined information;

adding a data mark into at least one data-mark location in the first memory block if the first memory block is identified as a good block;

performing a data encoding function on the data with the data mark; and

writing encoded data into the first memory block.

8. The method as claimed in claim 7 further comprising:

skipping the first memory block if the first memory block is identified as a bad block; and

identifying a second memory block among the plurality of the memory blocks, which is next to the first memory block, as a good block or a bad block.

9. The method as claimed in claim 7 , wherein in the first memory block, the data-mark location is different from the predetermined location.

10. The method as claimed in claim 7 , wherein the data decoding function performs error-correction code (ECC) decoding.

11. The method as claimed in claim 7 , wherein the step of identifying the first memory block comprises:

checking at least one predetermined location in the first memory block;

determining whether the at least one predetermined location is marked by predetermined information; and

identifying the first memory block as a good block if the at least one predetermined location is marked by the predetermined information.

12. The method as claimed in claim 7 , wherein the first memory block comprises at least one page having a data area and a spare area, and the at least one data-mark location is on the first byte of the spare area.

13. A block characterization method for a memory including at least one memory block for storing data, the method comprising:

performing a decoding operation on the data;

determining whether the data decoding function was performed successfully based on a memory block status corresponding to a previous writing operation and based on data stored in at least one data-mark location of the memory block;

in response to unsuccessful decoding of the data, checking at least one predetermined location in the at least one memory block;

determining whether the at least one predetermined location is marked by predetermined information; and

identifying the memory block as a good block in response to a determination that the at least one predetermined location is marked by the predetermined information.

14. The method of claim 13 , wherein the predetermined information is specified by a vendor of the memory.

15. The method of claim 13 , further comprising:

adding a data mark into the at least one data-mark location in the at least one memory block if the at least one memory block is identified as a good block;

performing an encoding function on the data with the data mark; and

writing the encoded data into the at least one memory block.

16. The method of claim 15 , wherein the at least one data-mark location is different than the at least one predetermined location.