| 摘要 |
A method of data recovery in systems employing error-correction coding techniques is described. The technique may be used, for example, in conjunction with a data storage device (12). Several trials of accessing the ECC-protected data are performed. The data from each trial (20) is decoded, and is also saved. If none of the trials results in the successful decoding of the data, then a reconstruction function is employed to create a reconstructed version of the data (22) from the sequence of data created by the trials. One method of reconstruction involves majority voting on a symbol-by-symbol (21) basis. The reconstructed data created that way is then decoded in the same fashion as for each trial. A more powerful reconstruction function employs a threshold to determine whether each voted-on-symbol is sufficiently ''reliable''. If not, it is marked as an erasure. The reconstructed data created by this reconstruction function is decoded according to an error-and-erasure algorithm, which increases the error-correcting power of the ECC. |
